Hello Chindam, I hope you are doing good and healthy.

In the DU JAT application form, you have to fill your 12th class marks.

Firstly, you need to register yourself on the official site of DU. Then you will get the access to the application form.

In the application form, you first need to fill your personal details after that go to the academic section.

In the academic section, you first have to select your 12tu board of education like CBSE, RBSE, etc. Below that there will be a column for the subjects taken in board examination along with the maximum theory marks, practical marks and total maximum marks of the respective subjects and marks obtained by the student in those subjects, so in that you need to fill your 12th board marks.

Similarly fill rest of the sections.

Best wishes for your future