Distance learning Centre-Karnataka State Open University

https://www.shiksha.com/university/ksou-karnataka-state-open-university-mysore-20436

What do you mean by Purchase? Purchasing a degree is not a legal way, I would recommend if you are doing Computer science engineering and want to do Law degree course also then go on legal way else you can't be successful with your fake degree.

As per the guidelines of Bar Council of India, correspondence course in law including Llb is not recognised. So there is no recognization to courses in law offered by correspondence and if any college is offering correspondence course in law then it might be flouting rules of Bar Council of India. Further, if you choose to do LLB from such college then you might have issues in registration with Bar Council after completing the course. so choose wisely.

Yes, you can do LLB course after pharmacy course or any course. After class 12th, you can join 5 years integrated course or 3 year degree course after any other degree.

Candidates must have scored 45% in graduation/post graduation to get eligible for the course.

Yes, you can do LLB. You are eligible for a 3 year LLB course for which, you may opt any private institute or you can appear into entrance exam in DU.

Yes, you are eligible for getting admission here. So, just apply for the admission. You will get admission.
Good luck.