hi,

see DELHI CET diploma entrance exam is conducts by department of training and technical education, delhi. however eligibility criteria is applicants should Passed 10th class or any other examination recognized as equivalent  examination, conducted by CBSE / other board with minimum 35% or 3.7 CGPA aggregate. The subjects Science, Mathematics and English are compulsory to study in 10th standard and the candidate should have passed in each of these three subjects. so it does not matter of individual score you have got in math or any other subject. your average score of  10th class marks should be 35% or more . you must have got the pass marks in maths , english and science subject as per your education board.

for more information follow the below link:

https://delhidiploma.admissions.nic.in/webinfo/File/GetFile?FileId=55&LangId=P