U can test street foods any where in Mumbai because of Mumbai don't having one specific type of food u can get different food's at different places of Mumbai
Outside HR College you have Raju rolls... mind blowing food...also everywhere you get amazing street food....there is khau gali outside hinduja college
Misal Pav - Maamledaar, Thane Railway Station. South Indian - Ram Aashray, Matunga & Aiyappa Dosa Stall
Street Foods - Khao Gali, Ghatkopar & Mulund. Also near beaches in South Mumbai
For Non-Veg - Visit any Muslim Dominated Areas such as Mahim Dargah Road or Minara Masjid at Bhendi Bazaar and some joints in Bandra
For Biryani - Look for Borivali Biryani Centers in Suburbs
For Vada - Come to Krishna Vada in Dadar TT
Outside HR college, NM_ Mithibai college road, kirti college road, opposite dava bazaar at zaveri bazaar. btw any galli is khau galli in mumbai... binge bindaas