For B.Sc. Mathematics (Hons) in Delhi University, the following are the top 5 colleges known for strong academics, good placements, discipline, and a safe campus environment:

1. Hindu College – North Campus
   One of DU’s most prestigious colleges, offers excellent faculty, placement support, and a well-guarded campus.

2. St. Stephen’s College – North Campus
   Highly reputed for its academic environment, strict discipline, and top placements, though admissions are based on both CUET and interview-based selection.

3. Kirori Mal College – North Campus
   Strong in mathematics, active student societies, and decent placement record for analytics and research roles.

4. Hansraj College – North Campus
   Offers great infrastructure, strong math department, and has a reputation for safety and discipline.

5. Ramjas College – North Campus
   Academically competitive, with regular seminars, research exposure, and a supportive campus environment.