Dear Aspirant,

According to your question our college predictor is absolutely correct you are getting the difference because in 2020 There is only two attempts. But in 2021 there are 4 attempts according to which it shows the data of last year because there are more two attempts to be done then you can calculate the total no of students because one students are giving more than one  attempts in the exam . So after the total Candidates giving the exams then only the predictor will be updated according to it. So kindly have wait and check the college predictor after the full data is updated by NTA.

Hope this Helps.

Good Luck!