Hi Nitesh,

The following tips will help you in the preparation:

• You can join crash course from best institutes if you want.
• Refer NCERT books for all subjects- Biology, Chemistry, Physics.
• You can use other books like O.P.Tondon for Chemistry. For Physics you can refer Concept of Physics by H.C.Verma.
• Solve previous year question papers. 
• Prepare the topics of each subjects which have more weightage then go for the other. 
• Make startergies on daily basis according to the syllabus and days left for the exam. Follow them daily.

Hope this helps. All the best!!