Hello Yash,
Selection Criteria: They select on basis of 12th Board marks and All India CLAT ranking. On the basis of these two parameters, they allot you a merit number. The person with low merit number are being selected until the seats are being filled up.
Therefore, there may be equal chances of a person having 1) AIR 1500 and 90% 12th board marks and 2) AIR 2000 and 94% 12th board marks. ( These are hypothetical examples only to explain the situation. It may not hold true in all circumstances and the degree may vary according to preference criteria of the college).