how to get good marks in NEET biology?

There may be two reasons behind this issue. First one, your basics are not clear, lack of confidence and secondly you have done the test in hurry and you have crammed the topics.

But dont worry. Still you have time. Just have some confidence and check where all you are still lacking by giving full length mock papers. Once you get the topics, next step to do is start preparing for the same properly again.

Lastly, just keep yourself calm and confident.

Good Luck!!!