Architecture

You can get the following Colleges through JoSAA as under.
1. VNIT Nagpur
Further the following are the other colleges accepting the JEE Main paper-2 score are as under. Please apply through State Common Entrance Test Cell, Maharashtra State website if interested.
1. Sir J. J College of Architecture
2. Institute of Design Education and Architectural Studies, [IDEAS] Nagpur
3. Balwant Sheth School of Architecture (NMIMS), Mumbai (Own admission process).

The employment outlook for environmental engineers is excellent. The field is projected to grow 15% from 2012 to 2022, which is faster than the average for all occupations. Some growth will be fueled by the need for water reclamation projects that increase water supplies, especially in Western states.

I don't think you can get any college through JoSAA. Try for private college or state government college.

http://www.nata.in/
Have a look at this site.

Hi
You can apply in NATA in your class 12th. https://www.shiksha.com/architecture-planning/nata-exam-syllabus.

Following are a few colleges in Pune offering MBA in the desired specialisation.
1. SCMHRD Pune
2. IIMS Pune
3. ISMR Pune.

Private colleges are the only options. The following colleges can admit you on the basis of JEE Main Paper-2 rank you obtained.
1. LPU Phagwara
2. Chandigarh University
3. Amity University
4. GITAM School of Architecture, Hyderabad
5. AJEENKYA Dy. Patil University, Pune.

Following colleges in Bangalore could be the best for you.
1. Christ University
2. PES University
3. REVA University.

For JEE Advanced, you need to qualify JEE Mains paper 1. Paper 2 is only for B.Arch colleges.