Hi Nizam,

Cutoff: It is the score which helps you get a seat in medical college. For eg: if your score is 500 and college A cutoff is 400 and college B cutoff is 520 then you will be eligible for a medical seat in college A and not in college B.

Percentile: It is a way to divide population. Here population is the total number of applicants for the exam. 50 percentile means that that you have performed better than 50% of the population. This percentile qualifies you for counselling but it could not be guaranteed that you'll get a seat.

Minimum qualifying marks varies every year depending upon the number of applicants, number of seats sanctioned and the overall performance of the candidates.

For more information you can refer the following link:

https://medicine.careers360.com/articles/neet