Lucknow

As far as Jaipuria is considered, Lucknow campus has better ROI and placements than Noida campus. The fee structure is around Rs.8 lakhs for 2years.

Hi,
Your question is too wide. Which state do you prefer?

Now that you have started your BBA, you can go for LLB course after BBA. Earlier, you could have opted for BBA+LLB Integrated course which would have been beneficial.
Top colleges for pursuing law are:
University, Bangalore (http://www.nls.ac.in)
UPES, Dehradun (UPES- Asia's first core sector university (http://www.upes.ac.in) - This colleges has further specialized courses in law, you can check their website.
National Law University, Jodhpur, (http://www.nlujodhpur.ac.in)
Campus Law Centre, Delhi (Campus Law Centre (Campus Law Centre (http://clc.du.ac.in/)

No, you have to appear in JEE or UPTU entrance exam, then you can get the government college, if you get a good rank.

Yes, there are a lot of engineering institutes which can provide admission to you with low fees. If you have scholarship then you will face no problems in fees.

Jaipuria Noida is a better campus as in this campus there is more industrial exposure as compared to Lucknow.