Degree

Hi Harshal
The advertising industry is highly competitive industry. If you are a creative and target oriented person, this is a great career option for you. You can pursue Post Graduate Diploma in advertising in order to take your career interest further. You can find the top colleges and their details here https://www.shiksha.com/mass-communication-media/articles/top-5-colleges-offering-advertising-courses-in-india-blogId-11049

There are different Diploma courses in education starting from 6-months to 2-years. Your course and Diploma will be valid if your institution and university is recognised.

Hi Pratiksha,
You cannot do both as you are already doing a regular degree course. Fashion designing course is also a regular course and if you can manage your time then you can do your Diploma in fashion designing, but you need to manage that or else you can do fashion designing course through distance education where classes will be on Saturday and Sunday, these are the option available for you.

The courses offered by IGNOU are well recognised, not only in India, but in other countries also.

No, you can't pursue both degrees from government institute, as this scheme was started by private institutions. No government institutes offer such scheme.
If you wish to do both the qualifications, then you can do it. But, from separate government institutes.
I'm also pursuing Diploma at present from Pusa Polytechnic, and I wish to pursue degree from DTU.
You can appear for CET for Diploma and LEET for DTU.
I hope I've made myself clear.

Different colleges need a different cut off. This varies year to year. You can see all the details on the official website of each college. Backlog is not that much of problem once you clear it. It may even go unnoticed. Always keep your answers ready for the interview, just in case.
Top colleges: 97+
Good college: 94-95+ usually
Decent colleges: 85+Depends on the criteria set for each year.

Hello Swapnil,
This is an excellent question. Animation is a non-conventional career option with non conventional recruitment method. The Studio/ Company guys will be more interested in knowing your skill and your knowledge rather than knowing whether you have a degree/ Diploma certificate or not. If you have acquired good skills then any certification from any well-known institute can help you in getting a good job.
Feel free revert if you have any doubts.