Harsha, 98% of the questions from NEET are asked from syllabus as in NCERT books alone. Its the 2% that comes from other sources. Like for example, Earthworm and Frog are not included in NEET syllabus. But there have been times when there are questions asked about both in the previous exams. So it is good to be prepared. You can try these books:

Biology Best Books:

NCERT Biology Class XI and Class XII textbooks
Biology Vol 1 and Vol 2 by Trueman
Objective Biology by Dinesh
Objective Botany by Ansari
Pradeep Guide on Biology
GR Bathla publications for Biology

But given the fact that there is hardly a month to prepare for NEET, will you be able to cover all these. But yes, these books can help you gain knowledge over those additional 2% as well. So practise previous question papers. They usually give you a clear idea of what to expect.

Hello..Hope you are doing well!!

To crack the neet exam firstly you need to be perfect with your basics. Basics help a lot to crack any type of difficult exam. Ncert are morethan enough to crack neet exam. If are really thorough with ncert books and your 11, 12 text books then you can crack it. Still you want to get more knowledge then go through with other books regarding your doubts.

Hope this helps you.

All the Best!!