Classes are generally not going to be helpful for anyone whose score is already relatively high and who already knows the basic strategies. A tutor is a much better option as long as you get someone really good. If you live in northern or southern CA and you can afford it, check out
www.compassprep.com. I scored 1320 (old SAT) before Compass. You can probably guess what I scored on the new.
[Yes, I suppose it is true that anyone can raise their score with the help of CC and enough personal motivation, but that doesn't mean outside help is a bad thing. It's like hiring a personal trainer if you want help getting into shape.]