MBA in India

Yes, you are eligible to pursue MBA as the required minimum score in UG for MBA is 50%.

is tula dehradun is good for bba

It depends from one B-school to another. The government funded ones generally charge around Rs 2L as their tuition fees whereas the private ones may charge Rs 15-16L and even beyond.

You are not eligible to seek admission in MBA, as Diploma is not equivalent to graduation degree. You are advised to first do graduation degree in any discipline or subject of your choice to become eligible for MBS admission.

Work experience is not mandatory to seek admission in MBA in any of top 30 B-Schools in India but it's preferable. Students with work experience are able to relate to subjects being taught in MBA and share thier own experience in class discussions, case studies, team exercises etc leading to better learning.
I am sure even in BPO you would have seen and understood ITES company working. You would have fobe critical analysis of your company management functions. BPO experience and learning will come handy to you during MBA classes.

Based on return on investment, full time 2 years MBA from top 30 B-Schools of India is the best option. MBA at Ivory League B-Schools abroad is very expensive and may cost up to one crore plus but if you can afford such costly education then MBA in Ivory League B-Schools is the best in the world. You can opt for B-Schools such as Horward, LBS, INSEAD, etc.

Dear Deepak,
UK Ph.D stipend varies. Don't expect funding from too many universities, most programs are funded by the students themselves with only 10% to 20% of the fund being provided by the universities. You may expect around GBP1200 to 1800 per month if you have been depending on the university.