Law

Yes, you definitely can. It has its upper limit cut-off, nearly 1200.

Yes, you can complete you LL.B after your BCA. However, please note that there is no 3-years law program in National Law School of India University.

Hi,
It completely depends on which stream you wish to pursue. The average package in campus placements ranges between Rs 12-14 lakhs per annum. Apart from that, if you wish to litigate, it largely depends on whether you are doing it individually or working with someone initially. In individual practice as well, a lot depends on the place and area of law you are litigating. Further, working with senior will give you a fixed salary and a lot of experience. So there is no foolproof amount as to how much you can earn.

The rank list is changed every year. However as I checked some last year's cut-offs the maximum range was under 500 so it would be safer to score under 500 rank.
Good luck.