Just focus on your studies.
1 year is more than enough.
Solve variety of questions in every topic.
Solve all last year question papers.
Never leave any doubt unsolved, get it solved from your teachers.
Refer standard books.
Practice online free tests to have feeling of exam.
Maths helps in both topics physics and mathematics, so practice it more.

Hello buddy, Don't waste your time and start preparing as soon as possible. Bcz 1 year is not enough to  prepare for jee advance and to clear syllabus of both 11th and 12th but enough to prepare for jee main. You have to work very hard to get seat at IIT if you are from general category. Work hard,join a coaching Institute. Practice as many questions as you can. 

Best of luck for exam buddy. 

You have enough time to prepare for both JEE and Boards.. 1yr is more than enough.. You just keep calm and do your study and hard work too.. Practice mock test questions..
Best of Luck!

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