The best way to improve in Quant is to master it one topic at a time in the following way:
- First, review the concepts and strategies a topic involves.
- Then, do practice questions involving that topic UNTIMED until you're achieving high accuracy.
- Finally, work on reducing the time per question until you're correctly answering questions involving that topic at test pace.
Then, move on to the next topic and do the same thing.
Of course, that process takes longer than a few days, but maybe you've already been doing that.
So, to help us to answer your question, would you please tell us how you've been preparing for Quant and provide some more details about the results you gotten in terms of practice accuracies, reasons for missed questions, and levels of confidence in various topics?