SOA University - Siksha 'O' Anusandhan

It depends on the field you choose to go into. SOA gives scholarships to it's student based on their marks in 12th board exams. For different field it has a different amount as scholarships.

NITs are a brand in itself. The faculty members you get in NITs have a very good standard and also the exposure you'll get in NITs and IITs are a class apart. Even the fee is also very low.
Now coming to DTU, getting into DTU is tough due to reservation for Delhi candidate but this college also gives you enough exposure.

For admission, both marks and rank is required, because college changes on every rank.

Yes you can take admission but you cannot do two courses at the same time.

You can learn everything from course structure to fees to placement records at www.soauniversity.ac.in
Search for LLM on this official site for best information.