CBSE 12th

Hello, yes, after completing 12th and clearing the concerned exam, CBSE students can take admission in IP University.

After the boom of e-commerce people have started preferring online shopping and various brand due to same the market share of Ramond and other old brand has gone down.

For B.Com, universities like BHU, Allahabad, DU would be good option for you. But, you have to give entrance somewhere and somewhere your 12 score will decide merit list. You can also go for the college in your city. You can visit this link for a better knowledge. https://www.shiksha.com/b-com-chp.

Hello,
If you are willing to join engineering college with 50 marks in JEE Mains, then you are not going to get any NITs because now a days computer Science branch is in trend. You can opt for private colleges.
Good luck.

Hello
Yes! If you are interested to pursue BCA, you can definitely apply for BCA as you have computer Science subject you can apply for BCA.

Hello
There are many of the colleges around here like-
NMIMS Mumbai
SGVU Rajasthan
SSCBS Delhi
MCC Chennai
IBS Hyderabad
KJC Bangalore
NDIM Delhi
AIMS Bangalore
You can also check in the following:
https://www.shiksha.com/bba/articles/top-10-bba-colleges-in-india-blogId-7797.

Hello,
You are required to appear in BCA/B.Sc IT/CS+MCA entrance test to be eligible for MCA.
Good luck.

If you are confident enough that you can study for one year without any diversion. Then yes you can. I am a dropper and I was self motivated to crack JEE with a very good score. And yes I did it. Everyone is capable of doing it, just don't lose hope and work hard for a year. The amount of effort should be much more than you put in 12th.
All the best.