CBSE 12th

I ,am providing you the name of colleges you can check it :
DPG DEGREE COLLEGE - [DPGDC], GURGAON
IP university
DELHI COLLEGE OF ARTS AND COMMERCE - [DCAC], NEW DELHI
JESUS AND MARY COLLEGE - [JMC], NEW DELHI
KASTURI RAM COLLEGE OF HIGHER EDUCATION
JAMIA MILLIA ISLAMIA UNIVERSITY-[JMI], NEW DELHI
MAHARAJA AGRASEN COLLEGE - [MAC], NEW DELHI
ACHARYA NARENDRA DEV COLLEGE - [ANDC], NEW DELHI
ANSAL UNIVERSITY- [AU], GURGAON
FAIRFIELD INSTITUTE OF MANAGEMENT AND TECHNOLOGY - [FIMT], NEW DELHI
SGT University
For more you can refer to this link :
https://www.shiksha.com/accounting-commerce/colleges/b-com-colleges-delhi-ncr

It's quite impossible to get into a decent college with such a low score. I would suggest you reappear for these exams and score much better to get a reputed college. Your great academic scores would surely put you in the great stead.

Yes. Many private colleges offer admission with below 60 percent marks in HSC.

Both streams are good, but as per today's scenario, I would recommend you to go for economics honours because, in this field, you have many options. You can try to get into a consultancy or get government jobs.

You should go for BCA if you have interest in computers, fill all the entrance exam forms for BCA and give your best to get the best rank and you will get the best college, college means, best placement and best faculty members for bright future.