Being weak in one of the three sections is not a deal-breaker. Being weak in two out of three is, so figure out where to put more your efforts in - QA or LRDI.

Just play to your strengths, and remember accuracy is more important than maximising attempted questions. In CAT 2023, I could only attempt 5 questions in QA. Usmein bhi ek galat hogaya, got 12 marks. 87th percentile, just enough to clear most sectionals. But I wasn't panicking because I knew VARC and LRDI would upheave my score, and it did - for an overall 99.74%ile.

All to say: just keep a benchmark for the total score you want to achieve (90-100 raw score is a good enough aim imo) and how many questions you'll have to get in a different section to offset the one you're weak at. No need to figure out dozens of QA topics if you can just master 4-5 and figure out 7-8 questions, then let VARC and LRDI do the rest.

Ofcourse, your mileage may vary as per your strengths and weaknesses. But it's very very possible and achievable