dear student,
1) i wanted to tell u whenever u revise any topic write atleast 15 to 20 small small points on that topic (chapter wise) these points may include some formule of the topic so that after your board exam when u think about JEE ....go through these points only..... that will take less time to revise whole syllabus.
2) daily solve a paper seriously. u can buy any test series type book from any book stall.
proper planning is always required.and most imp how u execute your plan.
do not lose your confidence......i'll say "stand up be bold and take the whole responsibilities on your shoulders becoz u r the creater of your destiny"