B.Com

No you can't say that it is best but it is good one though.

Every DU College has well experienced and good faculty.
For placement related queries please follow this link:
https://www.shiksha.com/college/bharati-college-university-of-delhi-janakpuri-23938?rf=searchWidget&landing=ilp

Yes you can get with that much percentage but in the later cutoffs.

https://www.shiksha.com/college/hansraj-college-university-of-Delhi-malka-ganj-3062?rf=searchWidget&landing=ilp
On this page you will get to know everything.

Maitreyi College has good faculty. Infact I say every College Of Du has very good and highly qualified teachers. Depending upon various factors you can go in any college.

The fees is INR 9000 per semester and 54000 INR for complete 3 years.

The RRB entrance test is the only route to gain a job in the Indian railroads. The RRB departments have been conducting admission exams for various positions. Any graduate can apply for several of the posts in Group C. Some locations in Group C are on the commercial side, while others are on the traffic side. Those who have a commerce degree may do better in the business world.

Approximately Rs.5,500 per year.

Courses he can do for further education:
1. Bachelor of Commerce
2. Bachelor of Business Administration
or he can do any other course as per his preference. Can also enroll for certification courses to enhance his skills like Digital Marketing, Power BI, Advance Excel, etc.