Do not mug up everything in the last minute. Instead, prioritize the key topics and concepts carrying more weightage in the exam. Concentrate your energy on revising those things.
The most essential part is to solve previous years' question papers. It gives an exposure to the pattern of an exam, kinds of questions asked, and marking scheme. It helps one to evaluate strength and weakness.
Once you are practicing on previous year's question papers, time yourself. This gives an idea about time required for each type of question and section. It helps to manage the correct time for time management in the actual exam
As you do the practice of previous year papers, look for your weaknesses in the weak spots. Review the concepts you failed to grasp well and understand them more and better. You would improve the outcome.
Develop a plan that should include all significant topics. Devote a specified number of hours for each subject, and strictly adhere to your time table.
Do not study long hours straight without taking breaks. Take short breaks in between and refresh your minds so that you do not get burnt out. At times, you can listen to music, walk somewhere, or do something light.
Keep a positive attitude and believe in yourself. Avoid negative thoughts and self-doubt. Remember how well you have prepared and that you are more than capable of doing your best.
You need sleep for both your body and mind. Try to sleep for at least 7-8 hours before the exam.
Eat nutritious food and drink lots of water. Avoid junk and sugary drinks. When your body and mind are healthy, you will do even better on an exam.