Thanks for the vote of confidence. :)
Also, nice job on that last CAT!
Your quant scoring range right now is about the right level to think about using the Advanced Quant book, but that's also geared toward someone who's going to be taking significant time to push up to 48, 49, 50. If you aren't that invested in raising your quant score, then you may just want to work on tweaking things to try to get to 45-46 and leave it at that.
In terms of problems covered... you don't yet have the score that you want on quant, right? So that means you didn't get everything out of those problems that you could have. If you're not getting everything you can out of the problems you study, then continuing to do new problems isn't a super-great use of your time, right?
Read this article; do you ask yourself these kinds of questions when reviewing problems?
http://www.manhattangmat.com/articles/a ... roblem.cfmIf not, start doing that. Go back to old problems first in areas of weakness. Only when you feel that you've actually improved / learned some substantial things should you go test yourself on new problems to see how it goes.
When you get to that point, you can try GMAT Focus (
www.gmatfocus.com). This is a quant-only mini-CAT (24 questions) made by the real test makers. (Note: there is a fee; I think it's about $30 for each set of 24 questions.)
Also, is your course still going on? Sign up for office hours and talk to your instructor for more advice before or after class.