I read ncert properly but I can't get 300+ marks in neet ug what should I do .....??

Hi, Are you revising what to read, learn or understand?
If you are unable to score good then you need to take a look on your preparation method again.
1. You should have a proper time table and make sure you follow your study plans strictly.
2. You should have standard material even if less. thorough NCERT material.
3. Solve previous year papers. Take tests and mocks. Review your wrong answers. Analyse your weak areas and do not just escape.
4. Take guidance from experts, your coach or seniors and try to work on problem areas.

Do not think that taking the easy ones only will fetch you good score. NO. You will have to come out of your comfort area to grow.
Let me know incase there is something else you are facing while in your preparation.
Good Luck.