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Compute a percentile from your rank and the number of candidates in the session.
Percentile: 99.9990
Formula: 100 × (candidates − your rank) / candidates. NTA percentile uses its own tie rules.
Percentile here is 100 × (candidates in that session − your rank) ÷ candidates in that session. It is the arithmetic form of a percentile. NTA applies its own tie-breaking rules, so the official percentile can differ.
Use the candidate count and rank from the same session. Mixing January and April numbers, or mixing two papers, produces a figure the result does not use.