McGraw-Hill test prep?

<p>Hello fellow ACT studier-s...</p>

<p>I've been using the McGraw Hill ACT book of 10 practice tests. I have been doing well, but I'm a little apprehensive about my scores...
Looking at past ACT curves seems to indicate that the real deal is graded a lot harsher than the tests in this book, especially in science. Does anyone have any insight into the accuracy of this book? I want to get an honest feel for how I will do, is this the best resource?</p>

<p>Thanks!</p>