Hii Tharun!
The key to succeed and get good marks is only Hardwork. The more you study efficiently and smartly along with putting in efforts ( hard work ) the more you perform well. Make a timetable after analysing the syllabus well. Make note of your weak and strong topics. Initially pay attention to the weak topics and then towards your strong subjects. Follow the timetable strictly. Make small notes. Revise everyday. Solve problems related to the topic and solve previous year question papers. Clear doubts regularly with the help of your teachers. Take care of your health.
Hope this helps.
Good luck!