Firstly congrats,115 is a good score in NATA you may get best government as well as private colleges with these score.But your HSC score and your category is also considered while getting a seat for B.Arch.

Sir JJ Thomas college of Architecture is one of the best college in India which is located in MUMBAI ,to get admission in this  college a general category student requires 145+ marks and the final score is calculated as (NATA SCORE/2 + HSC SCORE).These formulae is accepted by many institutes for the admission procedure of B.Arch.

*The colleges accepting NATA score can be found in the below link :-

https://engineering.careers360.com/colleges/ranking/top-engineering-colleges-in-India-accepting-nata-score

Hope it helpful