Hi 15Prospective,
Good job on the improvement so far! There are a few things to think about here:
1. The questions get tougher as you get further into the Official Guide. So if your accuracy stays the same then you may in fact still be improving.
2. How is your review going? You should spend at least as much time reviewing as you do solving questions. Here is an article on
GMAT study habits. It is also important to
review correct answers to make sure that you've gotten them right for the right reasons.
3. Do you have a strategy for all of the major questions types?
4. If you need extra tough verbal practice then consider working on LSAT Critical Reasoning/Reading Comprehension.
5. If your Quant is around 44-45 then consider using
MGMAT Quant sections and GMATclub Quant sections.
Hope this is helpful!
Happy Studies,
A.