Hello Pranshu !

You should have a stronghold on the subject matter you wishes to take.

Must stick to a Time-Table. Divide major subjects into broad categories and then allot time to each category. This can help in covering all the main subjects and topics.

Start reference books , Reference books and material can be fetched online, as there are a number of sites available that provide good study material. They can help in preparation to a great extent.

Solve Previous Years’ Question Papers , Solving  question papers on a regular basis  helps in managing and distributing time to each section of the question paper.

Hope it helps

All the best !