Hello there!
For passing in any subject you need to follow few quick steps-
1. Learn your concepts well.
2. Solve previous years question paper multiple times.
3. Solve mcqs to ace the concept, if you have time.
4. Learn well in advance.
5. Don't keep things for final day.
6. Don't worry and try to discuss it with your batch mates and toppers for last minute guidance. It helps.
7. Lastly, study. As there is no alternative for studies.
Good Luck!