Hello Fidha,

You haven't specified the name of college here.
But as much I know 12 marks are not added to marks of any entrance exam but they are kept as minimum eligibility criterian separately for admission to various degree programs along with marks of entrance.

The minimum eligibility criterian for admission of various courses generally ranges from 40 to 55 and varies according to category of students as well as course he want to pursue. Generally reserved categories get 5 percent exemptions for minimum qualifiying percentage for 12 th.

In order to get some more details please mention the name of entrance exam.

All the Best.