hi abhijit, you still have 5 months time and if you work smart, you can really score well easily, i will tell you how to prepare 

Physics and chemistry- physics is considered one of the toughest subject for medical aspirants,but very interesting. choose any good book of your convinience, there are plenty of good books as many mentioned already. read the concepts thoroughly,understand them cover to cover, if you have doubts, clear them then and there. solve atleast 300 to 500 questions per chapter, check ,analyse and rectify your mistakes. solve again. the more you solve the merrier.initially you wont be getting many correct answers, but as you keep on doing am sure you will see your score rising. solve previous question papers too

Biology-aiims doesnt cover most part from ncert like how neet does, in neet around 300 marks are from ncert text book itself, so u need to thorough ncert first and then read any good book of your choice and solve as many questions as you can

General knowledge and current affairs(for AIIMS only)- read newspapers regularly, keep yourself updated always, use year books, they ll help you alot.

English and logical reasoning-only for jipmer

hope this helps, ping me if you have any more queries, happy to help, good luck

Students either join coaching classes or engage in self- study when preparing for the PCB syllabus for all three exams.

If you join coaching: This is a preferred option for most candidates as NEET, AIIMS and JIPMER are national-level exams which see lakhs of students appearing. It is quite often seen that students who have taken one or two year coaching in reputed coaching institutes perform better in these exams and also grab the top ranks. So, if one is considering this option, they should ensure that they are very regular in their coaching classes. They should pay close attention to all that is taught in the classroom and try to attend the ‘Doubt Classes’ as well. Give proper focus and attention on NCERT and the study materials. It is also important that candidates do not miss out on any periodic tests conducted by the institute.

If you engage in self study: If you are not joining any coaching and intending to undertake self-study, then first of all prepare a daily time table for studies and try to follow it religiously. Keep your focus on both Board preparations and for NEET, AIIMS and JIPMER. Steadfastly solve as many previous years’ papers as you can in all three exams. If possible, for a short duration, join a good mock test series so that you are constantly in touch with NEET, AIIMS and JIPMER preparations and also competing with thousands of competitors which will keep you on your toes.