To score good marks in your exam it is very important the you have good hold on your subjects. You should have your basics strong. You can take help of your text book of class 12th. Practice makes lot of difference. Try to give extra attention to important topics which carries more weight-age in the exam. You can also solve MCQs. Solving complete mock test series is very important make sure you do proper analysis. So, that you can improve your performance. It will help you to know where you stand among other competitors. Try to increase your speed as well.

All the Best for your preparation and exam!!