What will be filled in this section??????of iit jam form

First of all discipline means the you subject of graduation or degree in which you have completed you degree so overall this means the degree in which you have qualified. 

You have to fill the subjects, that you studied during your graduation (BSc/BA/B.Tech., etc). For instance, if you have done B.Sc. Maths (Hons), then you can fill “Mathematics” in ...