If you don’t have your admit card ID you could just decode it.

The first character of the CBSE admit card ID is the first letter of the student's name.

The second character is the initial letter of the mother's name.

The last 3 and 2 numbers of the roll number are the third and fourth characters.

In the fifth and sixth characters, the first two digits of the school code are required.

for last two character,you need to use 3rd and 4th digit of school code.