LLB

Hello Saranya,
Normally speaking if the fees at both courses is same your college will allow shift. If it's question of you leaving present college and joining another college then it's very very tough. Of course not impossible.

Gourav, min.requirement to get enrolled for LLB is graduation so you need to do any graduate degree for admission in LLB.
These days, universities like Lovely, Sharda, Nirma, etc are offering Integrated BA/ BBA/ B.Com-LLB degrees, where students get to save one year as this course gets over in 5 years where as if you do them separately it takes 6 years to finish LLB.
Check the websites for more details.
Good Luck.

LLM is nothing it's just Master's degree in a particular field. After LLM, if you want to be professor, you can be easily go through in teaching field.

You can check: https://goo.gl/djH3nU

The only difference is that while LLB is 3 years long programme can be done after graduation, but of integrated law course, like BA LLB is a 5-years programme and can be done after 12th standard. On the other hand, after completing graduation and then LLB takes 6 years.

Please see: https://goo.gl/H15sNm

Please see: https://goo.gl/jo7VNk