Hi TjJoseph,
From what you describe in your post, you're actually discussing two different issues: why did you Scores decrease over time and where can you find additional study materials (to practice specific concepts)? Before I can offer you the specific advice that you’re looking for, 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)?
4) What were your Quant and Verbal Scaled Scores on the Official GMAT?
Goals:
5) What is your goal score?
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