Currently SSC Board is the final authority for the details like marks that this system retrieves. So unless there is a subsequent correction in that info by the Board itself, there is no possibility that information is incorrect.(unless in the rarest of rare case of electronic error in copying). If you notice any such mistake, you follow the same procedure as you might have followed when paper application was the only way. I.e you use Board data (copy given through your school) as basis for correction by the concerned college.