You should have a good command in your subject especially in physics and mathematics,and as you are class tenth you have a sufficient amount of time for preparation,keep the subject s strong recommended above,if possible take time to time guidelines from the people who have given this exam or have cleared it.Have a check on previous years paper of the exam as they provide a lot of help and keep your boards percentage above 65%so that it will help you more at the time of finding the best college.

Good luck