Geoff Martz Books

Cracking the GED test

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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.

Focusing on the strategies and information needed to prepare for the GED, this comprehensive guide explains how to use process of elimination and other proven techniques for maximizing scores on th...

Cracking the ACT

By Geoff Martz

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A guide to preparing for the ACT, including full-length practice tests, a review of all ACT subjects, and practice questions with explanations.

Cracking the GED

By Geoff Martz

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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 GED

By Geoff Martz

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Cracking the GED

By Geoff Martz

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Contains study tools for the GED high school equivalency exam, including subject reviews, drills, test-taking strategies, essay advice, and two practice tests; and provides answer explanations for...

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.