one of the way:

1. you can use two variables:
    xEnglish:
       if {tbl.field}='english' then mark_score else 0

    and xMaths:
       if {tbl.field}='maths' then mark_score else 0


2. Group the 'Admno'
3. make Sum for variable xEnglish and xMaths and put it based on the Group.
4. put the sum same line for the Group
5. hide for section detail


hope it help.