Yes, there is normalisation in SBI PO Prelims exam. As the exam is held in multiple shifts, the score of candidates are normalised to adjust the difficulty level of question papers. The result is declared based on the normalised score.
The exam will be held on different days and shifts and the level of difficulty will vary for each day and shift. In order to bring all the candidates to the same page and being fair for the marking the bank will use Normalisation.
Best of luck.
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