Hi Nikii,
The most realistic way to assess your current 'ability level' is to take a reputable practice CAT and take it in a realistic fashion (take the FULL CAT - with the Essay and IR sections, take it away from your home, at the same time of day as when you'll take the Official GMAT, etc.). Beyond that, analysis of each CAT is really important to defining what you need to work on - in simple terms, you need to define WHY you're getting questions wrong. You might actually have all of the knowledge that you need to hit Q50 right now, but you're getting questions wrong because you're using inefficient approaches, not doing organized work or making little 'math mistakes' in the Quant section. In those situations, working through more questions in a specific subject is probably NOT going to 'fix' your issues - especially if you're approaching the questions in the same ways as before (and leaving yourself open to making the same little mistakes).
Before I can offer you any additional advice for your studies, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) How long have you studied?
2) What study materials have you used so far?
3) How have you scored on EACH of your CATs (including the Quant and Verbal Scaled Scores for EACH)?
Goals:
4) What is your goal score?
5) When are you planning to take the GMAT?
6) When are you planning to apply to Business School?
7) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich