Best Test Prep?

<p>Hey CC Community!
I'm planning on taking the SAT one last time during my senior year. My parents and I have decided that it is in my best interest to take a prepatory course for the SAT, but i'm having trouble selecting a program. I'm currently looking at Revolution Prep, Kaplan, and Princeton Review. Revolution Prep seems very appealing, but i've heard some negative comments about their diagnostic examinations. As most of these prepatory classes are around or above $2000, I would rather not make a rash decision and waste my parent's money. I'm exclusively taking one on one tutoring style prepatory classes. Can anyone here suggest an effective program available in the Chicago area, or rate the programs I've listed? Thanks! On a side note, my composite score (superscored) is a 2190, I'm hoping to get in the 2300 range, but I'm struggling with the math section. If any of these prepatory programs are reputed for their mathematical expertise, recommendations would be much appreciated.</p>

<p>I also purchased the College Board’s SAT prep book, and I’m self-studying at the moment. Silverturtle’s guide is also ridiculously helpful. If anyone knows of any FREE online tools that are available, please let me know! (:</p>