I am able to solve (12-13) questions in quants with 80-90% accuracy. And after the mocks I am able to solve all the questions. How can I improve further. Please advice.

Hi Sourav, if you're able to solve all the questions after the exam, you need to improve your speed and exam strategy. Firstly, focus on the strategy during the exam: solve all the easy questions first, and only then move on to the medium / tougher qstns.