Dear Deepak,

In order to score good marks in NEET make sure your NCERT is completed to make your base strong and to clear all your concepts and fundamentals.
Your syllabus is based on NCERT books only. Exercises which are given ta the end of completing each chapter is extremely important.

You should focus on all the three subjects to score good marks.

To give edge to your preparation go through previous year papers to understand the exam pattern and level of questions. Focus on important topics you can solve MCQs related to important topics for your practice.

You can also solve complete mock test series to understand your strength and weakness. So, you can work upon them.

You should target to score more then 600 marks in NEET exam to get admission in top colleges.

Good Luck!!