Diploma

If you are not able continue studies then you can apply for an internship program or can also join training jobs to optimize your skills for the industry.
There are some blog you can read about this:
"Internship"
http://lkshya.com/internship.jsp
http://lkshya.com/Internship-vs-Training.jsp
All the best.

Diploma in engineering is not a graduation. So, its not a criteria for Master's degree. For a masters degree, you must have a bachelor's degree. Rather, you can opt for BE, you will get admission in 3 semester. After completion of BE or B.Tech, you can surely go for MBA.

Yes, you can do this. Some of the universities may ask for special requirement but most of them allow this degree. Kindly please research on the universities.

dear Rajat the approx fees will be 60k for a semester

Hi,
Tell us about your qualification details so that we can suggest you for further education. Like, level of exam you have cleared and in which branch you want to move further.

I think you can check few universities in USA which do offer B.Sc in nursing to diploma holders.

Dear Adil,
Kindly visit the links given below:
https://www.shiksha.com/getListingDetail/22322/institute/college-Zee-Institute-Of-Media-Arts-Mumbai-India
http://www.zimainstitute.com/contact-us.html
It will better, if you to contact directly to the institute.
I hope it will help you, feel free to ask more.
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Hi Juhi,
If you are planning to embark on a gaming or web development career, it is best, you look for graduate Diploma or MS courses. Auckland University of Technology, Waiariki Institute of Technology and Victoria University of Wellington are suitable options. Kindly check the university websites for further details.