Hello Nikhil ,thanks for asking question on this platform.now the situation  which you are facing comes in all aspirants's life even the same situation came in my life .and I think this is good for us because it will give a real challenge to you and then you will able to give your %.you have to just keep moving ahead without thinking of anything .and secondly after your result you will get several friends and now try to contact with your true friend also from the same field.i hope this will help you.thank you

Hello Nikhil,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 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.

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. In this way, you can make it possible to score good marks in JEE.

All the best