<p>The blue book is the first book you should have bought considering it is the only source of official practice tests by the creators of the SAT. You will have to pay for that book you will not find it online for free. I heard McGraw’s is not very goood though. Gruber’s is good for the math supposedly. I would say use the books you have read through them and do some practice tests and if you still don’t like your scores then go from there. I have also heard that Mike Barret’s Black Book and Direct Hits are good (I actually have these). </p>