Hi

It doesn't matter even if admission in Aiims or any college is through neet,
Neet is just an entrance examination and nothing else. Colleges/ states can have a different eligibility criteria.

For example,
To be eligible for assam state counselling one must score at least get 60% in Physics, Chemistry and Biology if belongs to unreserved category while it is 50% for those who belongs to  reserved categories.

You can check the same at
https://medicine.careers360.com/articles/assam-mbbs-admission

Similarly,
Aiims has a different eligibility criteria which is given below:-

to be eligible you must be either appearing for 12th board examination or should have passed 12th board examination with physics, chemistry ,biology and English and must have got:-

• at least  60  % in aggregate of PCB and English   in 12th examination  if belongs to general /obc category

• at least  50%  in aggregate of PCB and English if belongs to st/ Sc

• at least 45 % in aggregate of PCB and English in case of general pwd candidates to be eligible.

Also,

* to be eligible for Aiims 2021 one has to be at least 17 years old  by 31st December 2021

You can check the same by downloading the official brochure of AIIMS Delhi for which link is provided below

https://www.aiimsexams.org/pdf/MBBS-2020%20update%20%7BProspectus).pdf

Thank you