Hello,

In NEET maximum questions asked  from NCERT. Few questions will be directly come from NCERT and some questions will be modified of NCERT question. Also, there will be plenty indirect questions based on NCERT.  So, around 95% questions in NEET will be from NCERT. Very few questions will be high standard questions to differentiate the best candidates. So, if you study well and practice NCERT books it will be best for your preparation. Also, practicing previous year NEET questions are also required. you can get the question papers here

https://medicine.careers360.com/articles/neet-sample-paper

good luck!