For those of you who intend to complete every LSAT Logical Reasoning question ever published, there's a book for you. It's called:Grouped by Question Type: LSAT Logical Reasoning: The Complete Collection of Actual, Official Logical Reasoning Questions from PrepTests 1-20
This book is useful for two major reasons (which the title makes obvious):
Reason #1: Grouped by Question Type compiles all the Logical Reasoning questions from PrepTests 1-20 for you in one book, saving you the trouble of getting all the separate books you'd need if you wanted every Logical Reasoning Question from these exams. 10 Actual, Official, LSAT PrepTests only contains 7, 9-16, and 18. It lacks PrepTests 1-6, 8, and 17. You can still get those, but it's a bit of a pain. (19 and 20 are in 10 More Actual Official LSAT PrepTests.)
Reason #2: Grouped by Question Type organizes Logical Reasoning questions by the type of question, rather than putting them in order by PrepTest (as the traditional books of PrepTests from LSAC do). It divides them into different "chapters" based upon the type of Logical Reasoning question. This makes sense because these exams are so old (June 1991 - October 1996) that you'll want to take them in pieces, rather than as full timed exams. In my study schedules (for example, the 3-month study schedule), I recommend working through Logical Reasoning questions by type using the LSAT Logical Reasoning spreadsheet. This book saves you the trouble of constantly flipping between exams.
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While this book is a great concept, there's one reason it might not be for you - the Logical Reasoning questions are from the oldest PrepTests. If you only have a few months remaining before your exam, you might want to stick with Logical Reasoning questions from more recent PrepTests.
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I'm listing the chapters of the book below so you can see how the questions are categorized. You may be used to categorizing things slightly differently, but I personally like how this book breaks them down. Don't worry too much about the differences in categorization, though, because the book's brief introduction explains how the Logical Reasoning questions are categorized.
Chapters:
1. Introduction
2. Arguments
-Method of Reasoning
-Main Conclusion
-Matching Patterns of Reasoning
3. Flaws in Arguments
Argument Flaw
Matching Argument Flaw
4. What Can Be Concluded From The Information Provided
-Must Be True
-Must Be False
-Most Strongly Supported
-Point At Issue
5. Understanding The Impact of Additional Information
-Weaken
-Strengthen
-Evaluate the Argument
6. Assumptions
-Sufficient Assumption
-Necessary Assumption
7. Principle
8. Resolve
9. Index and Answer Key
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Who should use this book:
Most test-takers won't find this book absolutely necessary. However, people who intend to complete every LSAT Logical Reasoning question ever published will find this book worthwhile and convenient.
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Also see the Grouped by Game Type Book and Grouped by Reading Passage Type Book.
