Sir J.J College of Architecture

Yes, they give admission through JEE Mains. With AIR 146, you can easily get into this campus.

You have very good marks but for admission, you have to appear in counselling procedures.
Admission is through counselling conducted by Directorate of Technical Education, Maharashtra based on marks obtained in 10+2/ Diploma and score obtained in National Aptitude Test in Architecture(NATA).
Selection parameter and weightages:
10+2/ Diploma marks - 50%
NATA score - 50%

For admission in Manav Rachna University in engineering, you have JEE marks.
And in architecture, you have NATA, so don't worry. You have lots of choices for admission in various colleges.
For more information, please visit the link below:
https://www.shiksha.com/b-tech/articles/list-of-popular-colleges-accepting-nata-scores-blogId-10681

Yes, you can get admission.

You need to give the NATA exam (preferably before the end of May) and then in the month of June-July apply for the admission process of DTE. If your NATA score and 12th percentage are really good then you might get into Sir J.J. college of Architecturing.
Admission to B.Arch. is done on the basis of valid score obtained in NATA/ JEE Main 2018.

Yes, they will accept JEE paper 2 and NATA scores.

Of course. You have 90 percent chance to get admission in this campus. Attend the counseling without fail.

You should get more than 100 in NATA and 200 above in JEE to get a seat in JJ College.

Follow the JEE Mains college predictor below for details:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

First, visit this link to check B.Arch colleges based upon your rank:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=6919840
Then visit this link for various colleges which will provide you the brochure:
https://www.shiksha.com/architecture-planning/colleges/b-arch-colleges-india