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Greetings

NTA scores are calculated for respective shifts But this is calculated as to make the scores comparable because marks cannot be compared directly due to variation in the difficulty level of the exam.

 NTA scores are Directly comparable But Not the RAW marks obtained in the JEE Main, Therefore if Someone got NTA  score of 80 then He is better than NTA score of 79 but if someone got 80 Marks then we can not tell that if 80 is better than 79 if these marks are from different shifts.

Hope this Helps all the best