SSC adopts equipercentile method to normalise multi-shift exam scores; replaces average-based normalisation

The Staff Selection Commission (SSC) has introduced a new method for normalising scores in various SSC exams conducted across multiple shifts. The commission states that the change is intended to ensure that candidates who appear in different shifts are evaluated on a comparable scale.

The commission, after reviewing the effectiveness of the earlier method, has now adopted the equipercentile method for normalisation. Details of the new method were published on the SSC website through a notice dated June 2, 2025.

“After evaluating the impact of normalization, Staff Selection Commission has adopted a new procedure of normalization which is based on equipercentile method. The details of this method have been published on the website of the Commission vide its Notice dated 2nd June, 2025,” the official notice said.

Previously, as per the SSC notice dated February 7, 2019, normalisation was carried out by considering the highest scores, average scores, and variation of scores within each shift.

Using these factors, a candidate’s adjusted score was calculated to reflect performance relative to all examinees, not just those in the same shift. This method aimed to prevent candidates appearing in tougher shifts from being disadvantaged.

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Shift-based ranking replaces average scores

Under the equipercentile system, scores are adjusted based on candidates’ ranks or percentiles within their respective shifts rather than using averages and score variation.

The SSC explained that under the equipercentile method, a candidate who ranks above 80% of examinees in one shift will be matched with a candidate who holds the same percentile position in another shift.

By aligning candidates according to their relative position in each shift, the commission ensures fairness in ranking across shifts with varying difficulty levels. The SSC stated that the new method addresses issues where candidates in a particular shift could face content-related difficulties, which may not occur in other shifts.

The commission said that it is expected to provide a standardised comparison of performance while maintaining equity in evaluations. “The Commission will continue to work towards improving the systems so as to ensure the sanctity of examinations conducted by it,” it further said.