Hey there,
Most topper students get 330+ out of 360 in biology.
The average score in biology is around 300/360.
There is not very much difference in these scores.
The main difference in NEET Score comes due to physics and chemistry.

NCERT should be your everything. Go for NCERT.

First read completely the chapter in a short time.Then read it again thoroughly.
As you proceed towards the main content read with concentration twice or thrice.
Then start writing on a rough note, everything you studied, if you miss something again repeat the process.
Write a summary of NCERT about what you have memorized.
Draw rough diagrams with each and every labelling.
Now practice questions from previous year papers.
You will get to know the important topics, from where questions are asked frequently.
For a good command over the chapter start practicing questions from some NCERT based book.
After this if you have any weak areas, clear them. Revision is must.