National Law School of India University, Bangalore

Yes, CLAT (in this case) is necessary. It is also imperative to be a top scorer since it is the most sought after NLU.
Do self-study or join a coaching class.

You need to appear for CLAT examination (common law entrance exam) for getting into any NLU. For getting into any NLU CLAT score is the most important criteria and for NLU, Bangalore you need a score of above 145/200 in CLAT.

Hi,
As soon as the dates are out, you can apply through this website - www.clat.ac.in
The candidates have to follow the given steps for filling the application form:
Step 1- Register Online
Step 2- Login to Application Form
Step 3- Upload Images
Step 4- Enter Details
Step 5- Preview & Final Submit
Step 6- Payment
Step- 7: Print Confirmation Page

Hey there.
You have no chances of getting NLSIU as the rank for the college opens at the top when it comes to category rank as well you need to have a rank somewhere in top 20 among your peers in your category.
Also the general rank opens for the college for top 70 .
So unfortunately you have no chances of getting NLSIU at 556 category rank.

You will have to give some entrance exams like LSAT and others to get admission. Environmental law is a very great field, if you get admission and work hard in future.

No, NLSIU offers only 5-year law course immediately after your 12th standard. There are several other universities where you can do three-year law.