Hello,

No, NCERTs are not sufficient as they are good only for concept building. They don't have enough questions and examples to practise.

However, NCERT Chemistry is sufficient if you Mug up all the Intext Questions, Examples and Exercise Question. For Physics and Biology you need to refer to reference books as the key to cracking competitive exams like NEET is practising as many questions as you can.

Some of the reference books you can refer to are -

1. IR Irodov - Physics
2. HC Verma -  Physics
3. Trueman's Objective Biology
4. RC Mukherjee - Chemistry
5. OP Tandon - Chemistry

You can also take help of this NEEt Knockout package to increase your chances of qualifying NEET with good score - https://learn.careers360.com/knockoutfull-neet-may/?icn=neet-knockout-lpage&ici=navigation-header_neet

Hope this was helpful