Hello Suraj, 

Here is the list of law colleges in Mumbai. 

University of Mumbai, Mumbai

Government Law College, Mumbai

Maharashtra National Law University, Mumbai

Tata Institute of Social Sciences, Mumbai

Rizvi Law College, Mumbai

SVKMs Pravin Gandhi College of Law, Mumbai

Kirit P Mehta School of Law, Mumbai

Hey !
There are many top law colleges in Navi Mumbai, here I am going to list a few :
1)DY Patil University,Navi Mumbai
2) St Wilfreds College of Law, Navi Mumbai
3) Oriental College Of Law,Navi Mumbai
4) Mahatma Gandhi Mission's College of Law Nerul,Navi Mumbai
5)Chhatrapati Shivaji Maharaj University - (CSMU)
Hope this helps
All the best !