I am not able to increase the mock scores, what to do?

increase practice simple

Identify your weak areas by properly analyzing your mock. Work on them for 3-4 days then give another mock. See what has improved and what has not. Then again repeat the process. For quants, revision is important. For VARC, give sectionals of previous year questions. It is available on Cracku. LRDI also just practice and practice, especially attempt the previous year questions.