Hello aspirant,
1st of all, the percentile system is different that percentage system. Percentile system depends on the aspirant who scored highest marks, and keeping his percentile as base every other aspirant receives his percentile. Hence cut off of every college differs every year. depending upon total number of aspirants, highest scorer, number of seats, difficulty level.
If we take previous year records scores the cutoff has been nearly 176-208 for MS University.
So a score in greater than this will help you to have more chance of college conversion. also you have General EWS category so that will further help you.