Hello Nimrah!

As per the guidelines of University of Delhi, for pursuing post graduation in any course like Mathematics, you'll have to appear in the entrance exam if you are not a student of this university. For the students of DU , 50% of the total number of available seats are merit based and 50% are entrance based. So, they can apply through any of these two modes. But a student of any other university or institution will have to clear the entrance exam. Category based lists are then released for the different courses after the announcement of the entrance results.

Hope this answer helps you.