<p>How much of an increase have you seen from using this book? Also known as the red book.</p>
<p>Well what’s your previous scores when you’ve taken the ACT?</p>
<p>Edit: I just saw your other thread, with those scores and assuming you want to go to Harvard (by your screenname), you have a long way to go. Definitely get the book and do the tests, note your mistakes, learn from them, and don’t make them again. You’ll definitely see an increase that way ;).</p>