The Staff Selection Commission (SSC) has explained the reason for adopting a new normalisation method in its recruitment exams. The change aims to ensure fairness and transparency for candidates appearing in multiple shifts.
SSC Normalisation Process: What Has Changed?
Earlier, SSC used an average-based normalisation system to adjust scores across shifts. From 2 June 2025, the Commission switched to a percentile-based ‘equipercentile’ method. This method compares candidates according to their percentile rank rather than raw marks, ensuring relative performance is evaluated accurately.
For example, a candidate who outperforms 80% of their shift-mates will have their score matched with another candidate from a different shift who also performed better than 80% of their respective shift. This approach neutralises differences in difficulty levels between shifts and avoids penalising candidates assigned to tougher exams.
Why SSC Adopted the New Method?
SSC recruitment exams are conducted in multiple shifts, with each shift potentially having varying levels of difficulty. Some questions may be easier, while others may be harder. To prevent unfair advantage or disadvantage due to shift allocation, the Commission has implemented this updated normalisation process. The SSC has confirmed that this method ensures fair comparison of scores across all shifts. The Commission also stated that it will continue to review and refine its processes to maintain the integrity of its exams.
Old vs New SSC Normalisation
- Old Method: Based on top scores, average marks, and score variation in each shift. Adjusted scores were calculated for fair comparison.
- New Method: Uses equipercentile-based normalisation. Compares candidates by percentile rank, reflecting relative performance rather than raw marks.
This change has been implemented to safeguard candidates’ interests and maintain transparent recruitment practices.
