Dear Durga
Already our members had given so many suggestions. My suggestion is you to get proper sleep and also go and spend some time with your friends. Mind refreshing also plays major role in that.
All the best.

I m from K.V too, My suggestions
(Start from class 11 only)
1) Stick to basics,
2) Chapterwise attempt a self examination once every month for PCM
3) Thoroughly go through your NCERT(most important)
4) Follow a latest version of any of the JEE Mains and Advanced guidance book
All these things has to be done properly
With proper schedule, breaks and rests are also very important. Enjoy studying and hangout with your family and friends.
Before your exam, Don't read books, just go for mock exams regularly.
All the Best
My Intro- I m Ayush Chakravarty
Passed class 12 from K.V with 79% this year(2017)
JEE Main CRL 2543

First of all you should have a disciplined schedule. You have to clear all concepts no rattafication. Prepare ncert very well. Solve previous years papers. Be accurate and fast by practicing.

Study hard....
Don't waste your time here and there.
Read some standard books and try to solve previous years JEE MAINS and JEE advanced questions

Study regularly
Make proper time table
work exactly according to it
Make notes
Be confident
Lay equal stress on all three subjects
Coaching is necessary for jee advance

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