Exhibit 99.3

Houghton Mifflin Harcourt Company and EdTech Unaudited Pro Forma Condensed Combined Financial Information

On May 29, 2015, Houghton Mifflin Harcourt Publishing Company, a Massachusetts corporation (“HMH”), a wholly owned subsidiary of Houghton Mifflin Harcourt Company, a Delaware corporation (the “Company”), completed the acquisition (the “Acquisition”) of the assets comprising the Educational Technology and Services business (“EdTech”) of Scholastic Corporation (the “Parent Seller”) and Scholastic Inc., a wholly owned subsidiary of the Parent Seller (a “Seller” and, together with the Parent Seller, the “Sellers”), pursuant to the Stock and Asset Purchase Agreement (the “Acquisition Agreement”), dated April 23, 2015, between HMH and the Sellers.

In connection with the Acquisition, HMH paid to the Sellers an aggregate purchase price of $575.0 million in cash, subject to adjustments for working capital, which was financed with a portion of the proceeds from the New Term Loan Facility (defined below). In accordance with the Acquisition Agreement, $34.5 million of the purchase price was deposited into an escrow account to be held for 18 months as security for potential indemnification obligations of the Sellers. Portions of such escrow will be released periodically during the 18-month period upon fulfillment of certain service levels under a transition services agreement entered into as of May 29, 2015 between the Seller and HMH for the provision of certain transition support services by the Sellers to the EdTech business and HMH after the closing.

The “New Term Loan Facility” is an amended and restated term loan facility entered into on May 29, 2015 by the Company, as a guarantor, its wholly-owned subsidiaries, Houghton Mifflin Harcourt Publishers Inc., HMH Publishers LLC and HMH, as borrowers (the “Borrowers”), the lenders party thereto and Citibank, N.A., as administrative agent and collateral agent, to increase the Borrowers’ existing term loan credit facility from $178.9 million to $800.0 million, all of which was drawn at the closing of the New Term Loan Facility. The New Term Loan Facility matures on May 29, 2021 and the interest rate on the term loans is based, at the Borrowers’ election, on LIBOR plus 3.00% or an alternative base rate plus 2.00%. LIBOR is subject to a floor of 1.00%. The New Term Loan Facility is guaranteed by the Company and its for-profit domestic subsidiaries and secured by substantially all assets of the Company and its for-profit domestic subsidiaries pursuant to the amended and restated guarantee and collateral agreement dated as of May 29, 2015 between the Company, the Borrowers, the other guarantors and Citibank, N.A., as collateral agent.

The New Term Loan Facility may be prepaid, in whole or in part, at any time, without premium, except in the case of a re-pricing event within the first 6 months of the New Term Loan Facility, in which case, a 1.00% premium shall be paid. The New Term Loan Facility is required to be repaid in equal quarterly installments equal to 0.25% of the aggregate principal amount outstanding under the New Term Loan Facility immediately prior to the first quarterly payment date.

The unaudited pro forma condensed combined financial information presented below is derived from the historical financial statements of the Company and EdTech, adjusted to give effect to the Acquisition and its financing described above and adjusted for certain product lines not acquired. The unaudited pro forma condensed combined financial information should be read in conjunction with the accompanying notes and the respective historical financial information from which it was derived, including:

The unaudited pro forma condensed combined balance sheet as of March 31, 2015 gives effect to the Acquisition and its financing as if they had occurred on March 31, 2015. The unaudited pro forma condensed combined statements of operations for the year ended December 31, 2014 and the three months ended March 31, 2015 give effect to the Acquisition and its financing as if they had occurred on January 1, 2014.

The pro forma adjustments are preliminary and have been made solely for informational purposes. The actual results reported by the Company in periods following the Acquisition may differ significantly from that reflected in these unaudited pro forma condensed combined financial statements for a number of reasons, including but not limited to cost savings from operating efficiencies, synergies, and the impact of the incremental costs incurred in integrating EdTech. As a result, the pro forma condensed combined financial information is not intended to represent and does not purport to be indicative of what the combined financial condition or results of operations of the Company and EdTech would have been had the Acquisition and its financing been completed on the applicable dates of this pro forma condensed combined financial information. In addition, the pro forma condensed combined financial information does not purport to project the future financial condition and results of operations of the Company or EdTech. In the opinion of management, all necessary adjustments to the unaudited pro forma financial information have been made.

The pro forma condensed combined financial statements are based on various assumptions, including assumptions relating to the consideration paid and the allocation thereof to the assets acquired and liabilities assumed from the Sellers. The pro forma assumptions and adjustments are described in the accompanying notes presented on the following pages. Pro forma adjustments are those that are directly attributable to the Acquisition, are factually supportable and, with respect to the unaudited pro forma condensed combined statements of operations, are expected to have a continuing impact on the consolidated results. The final purchase price and the allocation thereof may differ from that reflected in the pro forma condensed combined financial statements after final valuation procedures are concluded and estimates are refined. The unaudited pro forma condensed combined financial information does not reflect any cost savings from operating efficiencies or synergies that could result from the Acquisition.

1

PART 1 – FINANCIAL INFORMATION

Item 1. Consolidated Financial Statements (Unaudited)

Houghton Mifflin Harcourt Company

Unaudited Pro Forma Condensed Combined Consolidated Balance Sheet

The accompanying notes are an integral part of these consolidated financial statements.

Unaudited Pro Forma Condensed Combined Statements of Operations

The accompanying notes are an integral part of this unaudited condensed combined financial information.

3

Unaudited Pro Forma Condensed Combined Statements of Operations

The accompanying notes are an integral part of this unaudited condensed combined financial information.

4

Notes to Unaudited Condensed Combined Pro Forma Financial Information

Note 1 - Basis of Presentation

The unaudited pro forma combined condensed financial information was prepared using the acquisition method of accounting. The unaudited pro forma condensed combined consolidated balance sheet presents the historical unaudited balance sheets of the Company as of March 31, 2015 and of EdTech as of February 28, 2015. The full-year unaudited pro forma condensed combined statement of operations presents the audited statement of operations of the Company for the twelve months ended December 31, 2014 and unaudited statement of operations of EdTech for the twelve months ended February 28, 2015. Further, the interim unaudited pro forma condensed combined statement of operations presents the unaudited statement of operations of the Company for the three months ended March 31, 2015 and of EdTech for the three months ended February 28, 2015. Certain adjustments have been made to the historical financial statements of EdTech to conform to the presentation and accounting policies of the Company, and for the exclusion of specific product lines not included in the Acquisition.

The accompanying unaudited pro forma condensed combined balance sheet gives effect to the Acquisition and its financing as if they had been consummated on March 31, 2015. The unaudited pro forma condensed combined statements of operations give effect to all of the above as if they had been consummated on January 1, 2014.

Due to different fiscal periods for the Company and EdTech, the March 31, 2015 unaudited pro forma condensed combined balance sheet is based upon the historical unaudited balance sheet data of the Company as of March 31, 2015 and EdTech as of February 28, 2015. The unaudited pro forma combined condensed statement of operations for the year ended December 31, 2014, includes the Company’s audited historical statement of operations for the year ended December 31, 2014 and the unaudited historical statement of operations of EdTech for the twelve months ended February 28, 2015 which was derived by using the audited financial statements for the year ended May 31, 2014 and adding the nine months interim period ended February 28, 2015 and excluding the corresponding, comparable, preceding nine month interim period, and is the full-year pro forma results of the combined Company. The unaudited pro forma combined statement of operations for the three months ended March 31, 2015, includes the Company’s unaudited historical statement of operations the three months ended March 31, 2015 and of EdTech for the three months ended February 28, 2015, and is the three month pro forma results of the combined Company. The difference in fiscal periods between the Company and EdTech does not result in material misstatements in the combined pro-forma financial statements.

The unaudited pro forma condensed combined financial information has been prepared for illustrative purposes only and does not purport to represent what the actual consolidated financial position or results of operations of the Company would have been had the Acquisition and its financing occurred on the dates assumed, nor are they indicative of the Company’s future consolidated financial position or results of operations. The pro forma adjustments have been developed based on assumptions and estimates, including assumptions related to the preliminary allocation of the consideration paid to the assets acquired and liabilities assumed of EdTech. The final allocation may differ from that reflected in the pro forma financial information after final valuation procedures are performed and amounts are finalized. In addition, the unaudited condensed combined pro forma financial information does not reflect any cost savings from operating efficiencies or synergies that could result from the Acquisition.

In accordance with accounting guidance for business combinations, Acquisition-related transaction costs are not included as components of consideration transferred but are accounted for as expenses in the period in which the costs are incurred. Total Acquisition-related transaction costs incurred by the Company were $5.2 million. These Acquisition costs are excluded from the unaudited pro forma financial statements through pro forma adjustments.

Note 2 – Acquisition of EdTech

On May 29, 2015, HMH completed the Acquisition. HMH paid an aggregate purchase price of $575.0 million in cash, subject to adjustments for working capital, which was financed with a portion of the proceeds from the New Term Loan Facility (See Note 3. Financing for additional information).

5

Notes to Unaudited Condensed Combined Pro Forma Financial Information

The purchase price was allocated based on the fair value of the identified assets and acquired liabilities assumed as of the date of the Acquisition. The preliminary amounts were allocated as of May 29, 2015 as follows (in thousands) and are expected to be finalized during the third or fourth quarter of 2015, subject to final working capital adjustments:

Assets acquired and liabilities assumed are presented at their estimated fair values. Estimated fair values are based on various valuation methodologies including: an income approach for the intangible assets; cost to deliver plus profit margin for deferred revenue; and an estimated realizable value approach using historical trends and other relevant information for accounts receivable and certain accrued liabilities. For all other assets and liabilities, the fair value is assumed to represent carrying value due to their short maturities. The excess of the fair value of the consideration conveyed over the fair value of the net assets acquired is presented as goodwill. Goodwill is primarily the result of expected synergies from combining the EdTech business with the Company. All goodwill and identifiable intangibles arising from the Acquisition will be deductible for tax purposes.

The fair value of the other intangible assets was primarily based upon the income approach. The rate used to discount the net cash flows to their present value was based upon the weighted average cost of capital of 9.6% and considers the related risk of the intangible asset. This discount rate was determined based on the Capital Asset Pricing Model, which looks at the risk free rate and applies a market risk premium, business risk premium and size risk premium to the risk free rate to calculate the cost of equity. The weighted average cost of capital considers the cost of equity and a market participant cost of debt and capital structure. Both the tradenames and the customer relationships were valued using a form of the income approach. The tradenames were valued using a relief-from-royalty method. The principle behind the relief-from-royalty method is that the economic value of an asset can be estimated based on the cost savings that accrue to the owner of an intangible asset through the avoidance of royalties or license fees that would otherwise be incurred through the use of the asset. The customer relationships were valued using a multi-period excess earnings method. The principle behind the multiple period excess-earnings method is that the value of the intangible asset is equal to the present value of the after-tax cash flows attribution to the asset only.

The customer relationships (expected useful life of 25 years) will be amortized using an accelerated depreciation method based on the projected annual revenue, which approximates the pattern in which the economic benefits are expected to be realized. The tradenames will be amortized on a straight-line basis over the useful life of 20 years. Estimated amortization of the intangible assets in the future fiscal years, subject to the completion of the purchase price allocation for the Acquisition, is as follows (in thousands):

6

The fair values presented above are based upon a preliminary valuation. Estimates and assumptions used in such valuation are subject to change. The actual amounts recorded when the final valuation is complete may differ materially from the pro forma amounts presented herein.

Note 3 – Financing

In connection with completing the Acquisition, the Company amended its previous term loan agreement (“Old Term Loan”) and entered the New Term Loan Facility, using a portion of the proceeds to fund the Acquisition. The amendment increased its outstanding term loan credit facility from $178.9 million to $800.0 million, all of which was drawn at closing. The New Term Loan Facility matures on May 29, 2021 and the interest rate is based, at the Borrowers’ election, on LIBOR plus 3.00% or an alternative base rate plus applicable margins. LIBOR is subject to a floor of 1.0%. The New Term Loan Facility may be prepaid, in whole or in part, at any time, without premium, except in the case of a re-pricing event within the first 6 months of the New Term Loan Facility, in which case, a 1.00% premium shall be paid. The New Term Loan Facility is required to be repaid in equal quarterly installments equal to 0.25% of the aggregate principal amount outstanding under the New Term Loan Facility immediately prior to the first quarterly payment date.

Information regarding financing sources and uses for the Acquisition is as follows (in thousands):

7

Notes to Unaudited Condensed Combined Pro Forma Financial Information

Note 4 - Unaudited Pro Forma and Financing Adjustments

The following is a summary of the pro forma and financing adjustments made to the unaudited pro forma financial information for the unaudited pro forma condensed combined balance sheet as of March 31, 2015 and the unaudited pro forma condensed combined statements of operations for the twelve months ended December 31, 2014 and three months ended March 31, 2015, and should be read in conjunction with the Notes 1 – 3.

The amounts included in the pro forma adjustment include elimination of amortization expense of $1.4 million and $0.4 million for the twelve months ended December 31, 2014 and the three months ended February 28, 2015, respectively.

Each 0.125% variance in the assumed interest rate of the term loan facilities would change pro forma interest expense by (in millions):