I have solved many model papers of BITSAT and got almost full marks in English Proficiency and Logical Reasoning. I want some tips in PCM.

If you have solved many papers, you must have found that you must be making mistakes in PCM as you say English and such you are scoring full but you seem to need to improve in PCM.

What every student should do after each model paper is to analyse where they did those mistakes, revise and get the correct method to solve. Once this analyse and revise strategy is followed properly and you are sure, go back and redo the paper again. This time you should get better marks. You see there is no easy preparation strategy. It mostly involves learning the subject, implementing the concepts in the answers, analysing weak areas and revising again till you get it right. All the best