Yes. RTI applications can be filed to DSSSB (Delhi Subordinate Services Selection Board) seeking details pertaining to marks obtained by you.
The application should be addressed to the designated PIO of DSSSB mentioning details like name of the candidate, Roll No., registration No., Post Name, Date of Exam etc. with a copy of the admit card and Rs. 10 IPO.
As RTI applications to DSSSB can be filed online on the government portal https://rtionline.gov.in, the wait time for getting a response can be expected to be a little less than usual.