Hello Abhijit

You need to study hard in order to secure full marks in Biology. NCERT Covers almost 70 percent of the questions asked in the exam therefore you should read NCERT thoroughly. You can also refers to Truman Biology in order to cover up the rest of the questions. You should follow these steps-

• Solve as many as MCQs possible.(MTG objective NCERT at your fingertips)
• Analyze previous years question asked in the exam.
• Revise all diagrams and tables from NCERT thoroughly.
• Study by making small time table.
• Revise as many as times possible.

Best of luck!