I'm in a similar boat. I've been through all the
mgmat topic series (except geometry), which really helped shore up my fundamentals. The challenges are now highlighting my weaknesses in two areas:
1) Reading and comprehending the details of specifics in question prompts
2) alerting me to question types that I'm not that good with - mixture problems, and complicated systems of equations. (I am terrible at age problems with more than 2 people)
I don't write each problem down I get wrong, although I probably should. Instead, I'm keeping a list of my weaknesses and using
MGMAT and OG to practice the fundamentals and then try realistic problems.
Right now I'm on pace to finish the OG Q supplement by end of the week, and from there I'll focus on challenges, CATs, and spend a little time on Verbal. I would be happy with a 44-45 on quant. My last GMATprep was a 44, my real GMAT in January was Q39/V42.