Hi Shailesh,

It is good to hear that you want start your preparation from now. The tips listed below will help you in your preparation:

• Go through the details of NEET syllabus and categorize the chapters from 11th and 12th that are important for NEET.
• Refer NCERT books for all the subjects as they are important and most recommended books. 
• Make a proper stratergy for each day and follow it.
• Once you complete a chapter, go through it's MCQs and make sure how much you have prepared for that.
• Try to solve previous year question papers.

The books will help you in your preparation:

• NCERT for all subjects
• Objective Biology/Chemistry/Physics by Arihant Publications
• NCERT at your fingertips by MTG Publications.
• Concept of Physics by H. C. Verma
• Organic Chemistry by O.P.Tondon
• Modern ABC of Biology
• Problems in Physics by I E Irodov

Don't forget to practice the numericals. 

Hope this helps. All the best!!