IPSA is one of the most known architecture schools in India. But this colleges doesn't offer Diploma in Architecture, instead it offers the BARCH and the admission is based on NATA. So if you are interested to go for this school you need to have passed 10+2 and qualify NATA.

To know more about NATA visit the link below:

https://engineering.careers360.com/exams/nata

Some of the Diploma in Architecture colleges in India are:

MSU Baroda - Maharaja Sayajirao University of Baroda

Aligarh Muslim University, Aligarh

Government Polytechnic, Lucknow

Aryabhatt Institute of Technology, Delhi

For more colleges you can visit the link provided below:

https://engineering.careers360.com/colleges/list-of-diploma-in-architecture-engineering-colleges-in-india

I hope this helps.