How should I prepare for the SAT?

I just received my scores today and I'm pretty devastated. I guess I overwhelmed myself with cramming for the APUSH Exam, APE Exam, & SAT. The dates to take them were so close, so I started ditching school just to cram; smh. Anyways I'm taking it again on November 5th. At least this time I want to be prepared. Even though I have summer assignments, I won't let that get in my way :) Do you guys know any helpful websites I can go to that are free so I can prepare for the SAT? Well anything would help as of this point, I have almost 3 months and a few weeks to study. I hope that's enough time. Oh, also any tips on studying :) BTW I have the Barron's SAT guide (25th edition to be exact)