I'm aiims, the marks of the highest scorer is taken as hundred percentile and the rest of the marks are graded accordingly.
However scoring 170-180 marks surely boosts up the probability of getting a seat in aiims
All the best!

HI, i can tell you the topper s percentile, its 100. good luck

To know the AIIMS toppers 2017 you can refer below link

 

AIIMS Toppers 2017

 

Good Luck!!

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