Heyy,
I highly doubt if that is possible, it is definitely not impossible, but it is by far very difficult to crack a tough exam like AIIMS by studying just NCERT and that too in just 3 months. This shouldn't demotivate you to not study, study hard for sure, but there are students who go for coaching for 2-3 years and still aren't able to clear AIIMS. Its very difficult, but not impossible.
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