hey mec

first of all it is very important for you to know it is quite tough to get any college specially government college at this percentage . du would be a good option but i dont think you can get admissions into it .you can try some private colleges with low fee as level of teaching is nearly same for all colleges .also you can look for other good courses . check out the list of colleges

https://collegedunia.com/bsc/mathematics/delhi-ncr-colleges

best wishes