Hi aspirant,

Both AIIMS and NEET are conducted separately. Both have different criteria for eligibility.

AIIMS require 60 % in 10 + 2 higher secondary. If you score less than this, you are not eligible to write AIIMS. There is least chance that AIIMS will not conduct its exam.

From NEET you are eligible to choose any college apart from AIIMS. But you should score more than 50 % aggregate as it is the eligibility criteria for NEET.

Hope it helps.