B.Sc

Yes, you will get a seat in B.Sc. In this university, your PCM marks would be considered. Your marks are good.
Regards.

Admissions are currently open in the institution. Contact the regional centre for more details.

Your chances are pretty good to take admission.

Yes, male candidates can also do B.Sc in Nursing.

The link below gives you the list of B.Sc colleges in Delhi/NCR:
https://www.shiksha.com/science/colleges/b-sc-colleges-Delhi-ncr

Yes, you can. The eligibility for IIT JAM is to have a minimum of 55 percent (for general category) in Bachelor's degree and 50 percent (for reserved categories). For more details, you may refer the link below:
https://www.shiksha.com/science/iit-jam-exam

The minimum eligibility for engineering and B.Sc is to have scored at least 50 percent in your board exams. There might be a 5 percent relaxation for reserved category students. However, the eligibility varies for each college and you may also need to clear an entrance exam depending on the colleges in which you wish to get admission.

No,
You cannot take admission for M.Tech after completing B.Sc.

Hello,
https://www.shiksha.com/mba/articles/top-5-mba-specializations-in-india-blogId-3223 Visiting the given link would help you get some valuable information about the MBA specialization you would wish to pursue.