Studying three subjects is honestly very overwhelming and challenging to do when I think of it now.
The approach to physical chemistry usually involves solving problems and reading theory.
40% theory, 60% problem solving. You know the important chapters, kinetics, electrochemistry, solids, and thermodynamics. If you are bad at the theory of any of these you should start focusing on theory first from any renowned book (Cengage, OP Tandon), work out solved examples and then practice.
You must have a good grasp of theory in the order they are taught in books. like intro to OC, then whatever groups and the ending with the nitrogen group.
You need to have a good grasp of Intro to OC (optical isomerism specially), for understanding the subsequent chapters and advanced questions go on to combine the different chapters you study after the Intro to organic chemistry. should to allocate a 70T, 30Q approach when reading some weak topic. 100Q can be done once your revision is done(mostly in last 20-30 days before exam)
I myself did very badly at this. You should focus on IOC more during the last 30-40 days before the exam. I can’t really recommend what exactly topics you should study because I don’t remember it at all. J.D Lee is a standard book, you don’t have to read the whole book. Best you can do is look at PYQ of advanced and see from jd lee which topics have the questions been asked from and do those specific topics. Have to go beyond NCERT to solve well.
Right now there are around 90 days left for the exam. You should focus more on the physical and organic for the first 30-40 days and study and make notes for inorganic chemistry and study the standard topics which are always asked in advanced like salt analysis and others.
Making short notes for inorganic is very important because you need to remember it all before the exam.
30 days before the exam focus should be more on inorganic and organic because these are easily forgettable.