Hello Uma

You should have studied Maths in the qualifying exam to be eligible to appear for the DU JAT exam.

According to the DU JAT Eligibility Criteria, candidate belonging to general category should have an aggregate of minimum 60 percent in four papers including English, Mathematics and other two subjects from the list of elective subjects as approved by the University of Delhi. 
For the reserved category (SC,ST,PwD,CW) the minimum percentage required is 55 percent in each of the four papers considered for computing the aggregate.

List of subjects - Arabic,Bengali, Botany, Biology/ Biotechnology, Chemistry, Commerce/Business Studies, Computer Science/ Informatics Practices, Economics, English, French,Geography, Geology, German, Hindi Italian, LegalStudies, Mathematics, Persian, Philosophy, Physics, Psychology, Sanskrit, Sociology, Spanish, Statistics, Urdu, History, Political Science, Zoology, Home Science, Punjabi, and Accountancy.

You can go through the link below and check the detailed eligibility criteria using the link below- 

 https://bschool.careers360.com/articles/du-jat-eligibility-criteria

Good Luck!