<p>I found the Blue book to be pretty accurate for WS MC ques, but if you want another measure, try the Online Course. There is a thread that shows you how to get it for free. Also, there are always people willing to trade or sell a recent SAT.</p>
<p>Take a couple of exams, and then you can confidently say whether you improved or are just doing better when you are studying by yourself at home in a comfortable enviornment.</p>