<p>I am planning to buy "Big Prep Book" from either Princeton Review, Barron's, Kaplan's, Gruber's, or McGraw Hill's. Do you know which one is most helpful? Also do "workbooks" are also helpful?</p>
<p>Red book is the best, then Princeton review, sparknotes, mcgraw hill is a bit easier but eveyrthing is relavent, for me kaplan is good except for their math, its weird, their question format is confusing just for math.</p>
<p>The Big Red book. That’s the closest to the real test that you will ever see. </p>
<p>The book consists of three retired (previously administered) ACT exams from the past few years.</p>
<p>Try the “Dissecting the ACT 2.0” one. It is very good and straight-forward. I used it, along with the Big Red book, and got 31. Five years ago, I did not speak a word of English, except “catch them all”, and “I love you”, so its quality has quite been proven.</p>