Degree

Yes, it is valid.

If you have failed the exam then you have to give the supplementary exam again in July, same year. If you pass that exam then you can apply for any undergraduate course.

No, you won't be allowed to admit in degree without passing class 12th. Clear those subjects in Supplementary exams, and then only you'll be eligible to pursue degree.

Hi,
At the time of admission, you need to produce your Bachelor's degree (provisional for current batch students). If you are certain that you will get the degree (upon clearing your backlogs of course), you can take the entrance exams like CAT, XAT, MAT, CMAT, SNAP, etc.

No. But B.Tech and BE are basically the same programmes with the same value. There isn't much difference.

Kindly visit this link:
https://www.shiksha.com/it-software/networking-hardware-security-chp

Yes, you can if you have done UG from a recognised university.

The fee for Bachelor's degree in hotel management is between INR 98.3-1.06 lacs per year.
It is affiliated to Annamalai University approved by UGC.

MBA in pharmaceutical management is a very narrow domain. I would suggest that you go for a general MBA as your graduation degree does not play an important role in MBA so even if you have done B.Sc in Hospitality management still you can pursue MBA in Marketing, HR, etc. Try going through this website https://www.shiksha.com/mba/ranking/top-mba-colleges-in-bangalore/2-2-0-278-0

Go for Masters in hospitality and hotel Management, as you have done your graduation.