Hi!!!!!!!!!!!!!!
Please follow the following advice . This WILL help.
1. Don't get bored to read the theory of ANY chapter. Even if it is done in class , do it again at home.
2. Start with level I problems and gradually advance to level III , solve each and every problem on your own. If you can't recognise the main funda behind it and re-read it from your text - book with a slow pace and keeping the problem in mind.
3. Donkey work is useless. You are going to write JEE in the morning , so don't study at night. Study during the peak hours.
4. Read the problem very very carefully and thinking over it for minutes before writing the first step.
Chill!!!!!!!