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Getting started on your revision for your IELTS or TOEFL is always the biggest step. Purchasing a great revision guide can be the easy kick start you need to get going with your preparation. These revision tools provide useful techniques and tactics to effectively answer different question types as well as general exam advice.

The second step, of course, is to actually use and read the book, soaking in all the techniques and tactics discussed. By the time your exam comes around the corner, aim to have completed all the exercises and practice questions in the book.

TOEFL

Official Guide to the TOEFL Test, Third Edition, By Educational Testing Service

Barron's TOEFL iBT Internet-Based Test, 12th Edition, By Pamela Sharpe

Kaplan TOEFL iBT with CD-ROM, By Kaplan

400 Must-Have Words for the TOEFL, By Lynn Stafford-Yilmaz and Lawrence Zwier 

IELTS

Cambridge IELTS 8 Self-Study Pack, By Cambridge ESOL

Barron’s IELTS with Audio CDs, By Lin Lougheed

Target Band 7: How to Maximize your score (IELTS Academic), By Simone Braverman

All of the aforementioned books are available on Amazon.com. Furthermore, many are sold locally at big name book stores. The prices for these books range from USD$9.00 to $30.00. Moreover, there is nothing wrong with using secondhand books as they will be almost identical in content to the brand newly published editions. Just keep in mind: Many of the newer editions include CD-ROMs, which are useful for listening practice. Good Luck!