Only 1 tip-MAke ur concepts clear and practise a lot of problems.
The following procedure can be followed-
1)BIOLOGY-NCERT is the god book.However for better understanding of a topic ,u can refer to youtube videos.I remember a few namely “shomu’s biology”,”Dr Sk singh”,”Etoos”.A lot of students do study advanced books like Trueman,however I feel its not required.
2)CHEMISTRY-Again,NCERT the god book.U can try RC Mukherji(atleast the easy solved examples) for physical.Try to learn the mechanisms of organic .For inorganic(except coordination and chemical bonding),ncert is enough.Useful Youtube channels-”Anytime Padhai Academy”,”Duswant Kumar’s channel”,”Khan Academy”.
3)PHYSICS-Remember,it will be playing the pivotal role bcz bio or chem bahut log kar lenge.NCERT and HCV(for problems) is enough.”Physics Galaxy by Asish Arora” can be of immense help.Each and every chapter is discussed there.
And the main thing comes,practise the previous years paper as much as possible.Also,I would suggest to solve ~iit jee physics and chemistry of 1975–1990.THose are not so difficult.
Enroll in test series of any coaching center online and give the tests seriously.