First for neet one have to give extra efforts. One have to balance between school and Neet studies.
You have to give extra time.
In my opinion first read ncert carefully and sincirely and then solve the questions. (Biology especially)
It will be helpful for cbse and neet both.
You should order akash or allen study materials read it solve question of it. If you have any difficulty ask your teacher or you can ask me also.
But you have to do it on regular basis give time to all subjects regularly according to your capacity. You should have to do extra studies regularly. Make your own routine on your own capability.
Preference of subject for neet