Read and understand the concept behind the different topics.

Refer Maharashtra Government textbooks of 11th and 12th standard of your chosen subjects. Also you can study from NCERT textbooks of 11th and 12th standard and practice questions from them too.

After you finish each chapter solve questions based on that chapter immediately. Make notes of chapters and also make notes of formulas which you can revise that the time of exam.

Give equal attention to every subject as they are all equally important. That is give time to each subject everyday.

Practice multiple choice questions of everyday. There are many different types of reactions in chemistry which can only be remembered by writing them. So write them everyday.

Solve physics numerical as many as you can.

If you still have any queries feel free to ask in the comment section down below.