<p>If you can get 2/3 of the Barron's test right then you are doing great! When I was preparing the best I ever got on the Barrons tests was a raw score of 39. Now, thats about ten wrong (because there is the penalty too). Most of the time I didn't get that high a score - maybe 36 or 37. And on the real thing I got 800.</p>
<p>So I would say that even if you only got a raw score of 25 or 30 on the Barrons tests, you will do quite well on the real exam, because of the generous scale.</p>
<p>Sorry, I can't really compare the subject matter on the practice tests - it was quite a few months ago now. Have a careful look at the 20 or so sample questions in the College Board book; they should give you an idea of what to expect on the real thing. You can get them off the CB site too.</p>
<p>If you are OK at pre calc you should be fine - you dont need calculus at all! Any other questions, just ask away.</p>