As a general rule, the final 2 weeks (roughly) should be reserved for a comprehensive review - that is, you're not working on improving weaknesses (much) at that point.
If you're still in "learn learn learn" mode, then your test should be further off. If you're happy with your progress / scoring level, then you can turn to review mode and take the test within a couple of weeks.
It sounds like you're crossing the two though - and that's why you're not sure what to do. Are you doing a comprehensive review? Or are you improving weaknesses?
If you're improving weaknesses, then you should be doing a "loop" of
(1) a set of practice problems
(2) intense analysis of those problems
(3) follow-on activities based on that analysis (reviewing part of a chapter in a book, making flashcards, drilling certain concepts, seeking out alternate explanations or solutions, etc)
then back to #1 and a new set of problems
Note: steps 2 and 3 are where you actually learn. You don't learn simply by doing the problems in the first place.
If, on the other hand, your current scoring range is what you want on the real test and you're ready for the comprehensive review stage, then these two articles will tell you what to do:
http://www.manhattangmat.com/blog/index ... an-part-1/http://www.manhattangmat.com/blog/index ... ew-part-2/