The percentile is calculated using the formula: $P = ((N - r) / N) \times 100$, where $N$ is the total number of candidates who appeared in that session and $r$ is the rank of the candidate based on their scaled score. Unlike the raw score (out of 180), which only counts correct/incorrect answers, the percentile reflects your relative performance. This is why a scaled score of 720+ often results in a 98+ percentile depending on the difficulty of that specific session.