Dear Javeria,
It is really appreciable that you are very conscious about your studies. In order to be perfect in your academics you should,
•    Concentrate your own studies,
•    Practice the concept or topic rigorously,
•    Take your own weekly tests and have their correction by somebody else,
•    Use techniques to memorize the definitions or terminologies,
•    Teach anybody else of your grade level who needs help
•    Pray from Allah (SWT) to help you in improving the result.