• Read your text book first and solve all the problem of Mathematics books.
• Try to write more. When you read one chapter, then solve all problems and note them.
• Make an time table. For how long you read daily.
• After releasing the 'Test papers' solve it to know the exam pattern and manger your exam time.
• Special care for Physics & Chemistry's mathematical problem.
• If possible read at late night. As this time is so quite and you can easily concentrate.
• Try to avoid Mobile, Computer games and Internet for this last three months.
At last believe on yourself. And work hard. You will defiantly win.
All the best.