Normalized marks in AFCAT refer to the process of rationalizing or equalizing the marks scored by candidates in different shifts. This is done by evaluating their marks on a standard scale or distribution, so that the scores of candidates across different sessions or shifts of the exam can be equalized. The normalized marks of a candidate in a particular shift are calculated based on the average marks of the top 0.1% of the candidates considering all shifts. The normalization process is used to adjust the values of data so that they conform to a standard scale or distribution. The AFCAT normalization of marks is done to ensure fairness and equity in the evaluation of candidates performance in the exam.