Colleges in Delhi

You can get most of the courses except some specific courses like economics, mathematics. https://www.shiksha.com/university/du-delhi-university-24642.

With this percentile there are very less chances to get into a good NIT but you can still try other private institutions and universities.

Mathematics / Statistics
50% marks in Mathematics and an aggregate of 45% marks in the qualifying examination.
The Merit shall be determined on the basis of one language, Mathematics and two best elective /academic subject.
* (MUSIC AND PHYSICAL EDUCATION ARE CONSIDERED AS ACADEMIC SUBJECTS WHEN YOU ARE SEEKING ADMISSION IN BSC. PHYSICAL EDUCATION HONORS OR B.A. MUSIC HONORS)
https://www.shiksha.com/humanities-social-sciences/articles/du-arts-admission-cut-offs-how-to-calculate-best-of-four-percentage-blogId-12763

There are pretty good chances to get B.Com in Delhi University with this percentage considering your category. Kindly wait for the cut-offs.

If you are having a good percentage that is required to meet the cut-off you can easily get into any one of the top colleges of Delhi University. Even with much lesser percentage you could actually get into any one of the college of Delhi University. Kindly wait for the cut-offs.

No, There is no specification like that for most of the courses. But, having mathematics is a requirement to get into courses like economics mathematics and other subjects.