The very first step should be to understand the exam. CAT is not about solving each and every question. Almost every year, scoring 50 per cent marks ensures 90+ percentile. One must tune oneself to try and find out all the easy questions and attempt them with high accuracy. What I did to practice this was attempt mocks and then analyse them. How to score 90+ percentile in CAT by Rishab Rahiman after each mock, I would look at the unsolved questions and understand their solution and also analyse which questions I should have attempted to maximise my score.
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The next important thing to understand is the syllabus. CAT syllabus usually revolves around 10th to 12th class portions (for quants). Try to brush up on the concepts as early as possible so that you can start giving mocks confidently. You need not know the full syllabus as you can always properly understand the concepts which you couldn’t solve while analysing the mocks or through a coaching class if you are enrolled in one. For VARC and DILR, get familiarised with the pattern before attempting mocks.
Next comes the tough part. How to score 90+ percentile in CAT by Rishab Rahiman Practice, practice and practice. Have a clear study plan. I used to solve 2-3 RCs every day, 5-6 DILR sets and a bunch of quant questions. Bring in a few mocks to your plan, and you will solve more than enough questions before D-day. Joining a coaching institute really helps here, because you might tend not to know where to solve from. I joined iQuanta (How to score 90+ percentile in CAT) last batch and got more than enough daily material there. Every morning I would log in to the doubts group of iQuanta and try to solve all the doubts questions. They were a really good source for quality questions.