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For calculation of the Percentile Scores Following formula Were Used By NTA.

Total Percentile (T1P): 100 X (No. of candidates appeared from the session with raw score EQUAL TO OR LESS than T1 score/ Total No. of candidates appeared in the session)

Mathematics Percentile (M1P):100 X (No. of candidates appeared from the session with raw score EQUAL TO OR LESS than M1 score in Mathematics/ Total No. of candidates appeared in the session)

Physics Percentile (P1P): 100 X (No. of candidates appeared from the session with raw score EQUAL TO OR LESS than P1score in Physics /Total No. of candidates appeared in the session)

Chemistry Percentile (C1P): 100 X (No. of candidates appeared from the session with raw score EQUAL TO OR LESS than C1score in Chemistry/ Total No. of candidates appeared in the session) 

For complete Details Of Normalization Please visit the Link Given Below:

Https://jeemain.nic.in/WebInfo/Handler/FileHandler.ashx?i=File&ii=4&iii=Y

Hope this Helps All the Best.