With reference to the quantitative raw score, I'm currently at the 80 percentile level also!
I know I can improve the raw score because I have identified certain areas where I can make improvements. Mainly:
1. DS questions taking too much time to solve
2. Permutation Combination & Probability questions taking more time
Thus, if I focus on solving more DS questions and some questions from the areas I have mentioned, I can improve my score.
What are the areas that you have identified as your weaknesses