Dear Ankita,

In order to score good marks in NEET in Biology section you need to read NCERT book thoroughly. Try to clear your concepts.

Solve all the exercises which are given after completing each topic.

There are chances that you can get direct questions from NCERT in your exam specially in biology section. 

You can also refer to NCERT exemplar. 

Solving previous year questions papers are very important to know the type of questions. 

Focus on the topics which carries more weightage in the exam and solve as many as MCQs related to them. 

If you want to score good marks in NEET you should focus in physics and chemistry as well. Don't ignore any subject. Work on your strength and weakness.

All the Best!!