If you are strong in Maths and Chemistry then you have to remain strong in that and try to be more comfortable in Chem and Maths.
If you are able to solve easy questions of Physics that involves using formula or conceptual question and you struggle in some types of advance questions then start with your strong chapter first.
3)From your strong chapter if you are able to solve 4 ques out of 10 (difficult advanced level questions) you have to reach a level and increase your accuracy to 7-8 ques.
The question you will be practicing (JEE Advanced level ) you have to deep dive the solution and have to analyse each step why we have done this and what strike us to do this step and what hints are given in question that drives toward solution.
Spend around 20-25 mins on the solution don’t just see the solution and move to next question do the method stated above first for strong chapters and then slowly for weak chapters ( ensure you can recall all the concepts you studied and are able to solve easy questions).