For finding or converting the CGPA to percentage 

The percentage of marks can be calculated as follows:

• Subject wise percentage of marks = 9.5 * GP of the subject
• Overall percentage of marks = 9.5 * CGPA

Example:

If a student have got total 9.6 CGPA,

Total CGPA = 9.6

it means his/her total percentage of marks = 9.5*Total CGPA

total percentage of marks= 9.5*9.6

total percentage = 91.2%

this was and is followed in CBSE I think this may be followed in your university if not than take the writen letter and than apply for exam.

Best of luck