<p>I just took a Sparknotes test and got a 780. I thought it was pretty easy. I find the Barrons ones more challenging. </p>
<p>On Barrons I get around 690-750. On the Princeton tests I got 740, 790 and 700. I find the Kaplan ones the most challenging (got 660 I think), although I think this is because I haven't taken AP Chem, and Kaplan seems to have some AP questions.</p>
<p>Also, on CollegeBoard tests I got 700 (old one, but I missed some pretty easy questions) and 740 (from new blue book, but it would have been a 770 if I didn't make stupid mistakes). I also took these tests a week ago, so I may be better at chem at this point.</p>
<p>Can I possibly get 790 or 800 by October judging by these scores? What should I do to get to that level?</p>