LLB

Jain University offers a good placement, but for the best placements National Law Universities will be the best choice.

Yes, MH refers to Maharashtra and therefore the exams are conducted there only.

Please refer to the link below:
https://www.shiksha.com/law/course/b-b-a-ll-b-hons-university-of-mumbai-fort-campus-fort-13940

To get admission in JSS College, the minimum percentage required is 45%.

See, if you want the degree just as an ornament, then you may probably choose any correspondence course to go for. Refer to the link below for detailed information:
https://goo.gl/1F7TuN

The specialisation depends on your area of interest. Not only civil and criminal litigations, but there are many more specializations available these days. They vary from ADR, Corporate law, Tax laws, Cyber laws and so on. Top class universities provide specialisation in these fields like Symbiosis International University, Christ University etc. Under 3 year LL.B. Programme.

No, you cannot practice with a Diploma. You need to have a LLB Degree in order to practice. Most places, including private and government require you to have a LLB Degree. However, certain paralegal work or research based work may be hiring people Diploma holders. But, full time lawyers need to have a degree of LLB.