Hello Shankar,

Your basics in Physics, Chemistry & Mathematics should be very clear upto 12th std. You should read the NCERT books for basics. Then HC Verma for Physics, RD Sharma for Mathematics, OP Tendon for Physical & Inorganic Chemistry, and Organic Chemistry of "Arihant Publication" for detail or extra knowledge. 
You should also try to solve the previous years question papers, this helps too much and you should also give the mock test to rectify yourself and build your confidence level.

For preparation of exam, the most important thing is your confidence after that you should know the whole syllabus and make your plan properly for learning new chapters, solving the numericals and revision. All three things should be the part of your preparation strategy in daily routine.

The main thing is that you have to build your concentration level, then only you can stay focused on your goal. I would like to say that please limit the study time between 10 to 12 hours and please increase your concentration and speed of reading, understanding and solving the problems then you will not face any kind of difficulty.
For more preparation tips, importants topics & books, you can go through the link given below
Https://engineering.careers360.com/articles/jee-main-2019

In this way, you can prepare well for the JEE Main and the JEE Advanced.
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All the best for your examination.

Hello,.I would recommend you to firstly clear your basic concepts from NCERT BOOKS and practice it's exercise questions..then only refer to other books like RD SHARMA for Mathematics,HC VERMA for Physics and OP TONDON for Chemistry.
Good luck.

Hiii

First of all i will suggest you to clear the basics with NCERT itself. Then you can go on to reference books. Here is a link that will provide you the details of best books for JEE exam.
https://engineering.careers360.com/articles/best-books-for-jee-main-2019

Thanks!!

Hello Shankar sir
The best books are first of all you should study well the NCERT books and later on go for the some of the reference books
The reference books are as follows
Chemistry go for O P Tandon
Physics go for H C vema
Mathematics go for R D Sharma
And also refer the some of the previous year question papers
Watch the videos regarding the related concepts of important JEE
And final thing is Follow the proper time table and time  management is required don't waste single minute of your valuable time

All the best

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