CBSE

Dear Soniya,
What is your entrance examination score, which examination that you have taken, normally, SIES will give admission on the basis of entrance examination. do not look back ab out your marks. leave it.
All the best.

It will depend on your rank.

No, you need to give SRMJEE to get into SRM. Management quota is there if you want to get in without giving the entrance exam.

Yes, an employer won't hire anyone in a marketing department unless they have a business degree or at least a graduation. Digital marketing is an extension of marketing and one need to have skills like communication, business acumen, using some tools, etc.

Hi Vamshikrishna!
You have a good score in CBSE boards but the JEE score depends on your caste. If you have crossed your cut off then you are qualified to write JEE Advanced and also to get NITs.
The caste wise cut off is given below:
GENERAL (OC)-81
OBC-NCL- 49
SC-32
ST- 27
PWD- 1
Verify whether you have scored above your cut off so that you may have chances to get admission in any of the nits. Try to score well in JEE Advanced, you may also get IITs.
All the best!

Kendriya Vidyalaya, DAV, etc.
These schools are reputed and provide good education also.
Delhi public school is also good in terms of education and discipline.