Geoff Martz Books

Cracking the GED, 2013 Edition

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Features the Princeton Review's score-raising techniques and answering strategies, an updated study guide, a subject-by-subject review of the test's topics, advice on studying, and two full-length...

Cracking the GMAT with 2 Practice Tests, 2014 Edition

By Geoff Martz

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Cracking the GMAT with 4 Practice Tests & DVD, 2014 Edition

By Geoff Martz

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Offers subject reviews, full-length practice exams with explanatory answers, sample questions and answers, and test-taking strategies to improve business school entrance examination scores.

Cracking the GED Test with 2 Practice Tests, 2015 Edition: Fully Updated for the New GED

By Geoff Martz

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"Get all the prep you need to ace the New GED with 2 full-length practice tests, thorough GED content reviews, and extra practice online. " - Amazon.

Cracking the ACT 2012

By Geoff Martz

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A guide to preparing for the ACT, based on the Princeton Review coaching course, offers advice on test-taking, specific suggestions for each section of the exam, and three full-length practice exam...

Cracking the GMAT

By Geoff Martz

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Offers subject reviews, full-length practice exams with explanatory answers, sample questions and answers, and test-taking strategies to improve business school entrance examination scores.

Cracking the GMAT 2009 Edition

By Princeton Review

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Cracking the GMAT

By Geoff Martz, Princeton Review

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Cracking the ACT

By Geoff Martz

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A guide to preparing for the ACT, based on the Princeton Review coaching course, offers advice on test-taking, specific suggestions for each section of the exam, and four full-length practice exams...

Cracking the GMAT 2010 Edition

By Princeton Review

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.