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All three are completely different. BBA is recommended, if you want to enter management. MBA would be needed after BBA. So, if you are planning to pursue MBA then go for BBA. BCA is Bachelors of Computer Applications. If you are interested in making a career in IT, then go for BCA, B.Sc can be done in IT, Computer Science, Physics, Chemistry, Maths, Biology, etc. If you want to make a career in IT, you can do B.Sc IT or B.Sc CS. I would personally not recommend you to do B.Sc in plain sciences unless you want to become a teacher or scientist. Ask yourself what do you want to do in life? What are your aspirations? Make a decision on the basis of your interests and aspirations. All the best.

I would give the TISS programme a high rating - based on the following:
To become a social entrepreneur, you need to understand the Biz and the nuances in which go in making a venture profitable or if it's a not-for-profit then sustainable. And for this some courses are important - especially HRM, Biz strategy, Marketing, Branding etc. TISS as an organisation has been an expert in RD for many years - and hence has an edge over other Social Entrepreneurship programmes - and they have grassroots working knowledge - hence making their course of high value. After all YOU shall have to implement the knowledge on the ground. Their course structure itself is highly field-oriented - hence shall give YOU a chance to learn while you work
If you have an idea - then great - use the platform TISS gives you to not just nurture your idea - but also make it flourish. If you don't have an idea - that's also perfectly fine. In my opinion, not all doers have ideas. And I have met many people with good ideas - who have not actually started up and done anything. Use the opportunity at TISS to find an idea of your own - or become co-founder with someone.