If you cover the whole NCERT biology book, you can easily answer 80-85 % questions of NEET-UG. Read the whole book carefully and make your concept clear. Do revise more and more regularly. Keep following the previous year question papers. All the best !

Yes ,NCERT is more than enough. It covers almost everything . you just need to concentrate and study . Try solving the previous year papers to get an idea on where to concentrate more and gain confidence in the subject. Solve chapterwise questionpapers if you can . Good luck

For NEET preparation you can do

1.Begin with NCERT NEET books and then move on the others

2.Read NCERT as well as other Reference NEET books cover to cover

3. No matter how lengthy the syllabus, do not indulge in selective study

4.Attempt as many mock tests as you can

5. Time yourself and evaluate your performance in the end.

And for biology you can complete these books one by one.

1. Moderns ABC of Biology for XI & XII – B. B. Arora, A. K. Sabharwal- Modern Publishers
2. Exploring Biology (Vol 1 & 2) – Sanjay Sharma & Sudhakar Banerjee – Arihant Publications
3. Objective Biology (Vol 1, 2 & 3) – K. N. Bhatia / K. Bhatia – Dinesh Publications
4. Medical Entrances Biology (Vol 1, 2 & 3) – Mamta R. Solanki & Lalita Ghotik – Target Publications.           All the very best