Hi! Welcome to the forums.
There are lots of possible paths to improving your Quant score—we need to know a bit more about what you've already done in order to advise you.
1. What is your current scoring level on the quant section of the exam? (For practice exams, please provide a score for an exam taken under 100% official conditions—no extra time, no extra breaks, etc.) What's your goal score? (If your goal score is on the overall 200-800 scale, then please also tell us your scoring level on the verbal section of the exam.)
2. What are your strengths and weaknesses on the quant section? If you've taken one of MPrep's practice exams, you can use the spreadsheet and videos in your syllabus (these are available in all syllabi, including the free syllabus) to analyze your most recent one. [Note: This will likely take you a
minimum of 1 hour and it will probably take more like 2-3 hours per section of the exam for Q and V—but you will then have a really great idea of your strengths and weaknesses, which is the cornerstone to figuring out how to get better.]
Alternatively, you can use the below article to analyze your CAT, but note that the spreadsheet tracker you'll find in your syllabus is more thorough / lays out the steps for you.
https://www.manhattanprep.com/gmat/blog/analyze-gmat-practice-tests-part-1/3. What materials have you used so far to study? And what are your general calendar and timeframe? Do you have a deadline by which you need to take the test? How much time do you have to study every week?