Hey bravo,
Man see if you are scoring less in mathematics due to some of your problem, then what you can improve is score as highest marks as can be possible for you in physics and chemistry, that wont let your percentage down ,your physics and chemistry marks will overcome your problem ,by doing this you can opt any of the delhi University college by fulfilling the percentage criteria ,i am suggesting you this because the bsc cs of delhi University are always on demand ,they would help you to make your future brighter.
Good luck!