After, you are comfortable in decoding questions, set time limits to solve the question. Initial results may be disappointing, but keep doing it. The scores will improve slowly. Identify which is your strong zone, DI or LR. Try to attempt your strong zone first while taking the mocks. This will help you build more confidence in the section. If there is time left, look at the cases which you think are tough. Now, there may be questions with no negative marks in some of the cases. Make intelligent guesses for these questions if you are unable to solve the question in its entirety. You may get lucky!
It is possible that while taking the test your results may fluctuate. You may score high marks in some of the tests and low marks in some others. That is okay. But your review of the mock, should reveal to you which angle about the solution you were not able to think. Keep a mental note and never make the mistake again. Once you spend some time working on your skills in this section, you will be able to solve cases accurately. In more than 75% of the cases of DI/LR, either you will solve the case correctly or you will not solve the case at all. There is little chance that you will solve the case incorrectly.
I would like to encourage you by giving my example. I was terrible at solving DI/LR sets. I was not even close to 70 percentile marks in the mocks initially. I put in some effort and developed my skills around it. My DI/LR percentile in CAT 2016 was 99.7 and my XAT Decision-making percentile was also more than 99 percentile. This year again, CAT may include surprise questions which may not be easy to solve, but if you are able to develop the skill of decoding questions, you will make the cut easily.
“If you want to play, then practice. If you want to win, practice harder.”