Hey there, sir jj college of architecture,mumbai is a government college. To get admission their you must score really well in jee mains paper 2 or in NATA. With that your score in your board exam should be above 85% or more. You can get admission their even if you are non- maharashtrian but you score in nata should be good. And if apply through jee mains then you have to apply separately not through josaa counselling. For more information visit the link 

https://www.careers360.com

Good luck