Architecture

Suyash,
You can apply for B.Arch with these class 12 marks and JEE paper 2 score. Many universities like Lovely, Chitkara, Chandigarh University, etc. are offering admission in B.Arch on this criteria. These world-class universities have wonderful infrastructure with good placements.
Some of them even offer scholarships on the basis of JEE marks as well class 12th marks.
Check their websites for more details.

Dayanadasagar College OF Architecture, Bangalore
CMR, Bangalore
MS Ramaiah, Bangalore
BGS, Bangalore
Oxford, Bangalore
These are some of the famous colleges in Bangalore.

But, in IIT Roorke you have to qualify JEE Mains paper 1 and JEE Advance, and then you need to appear for separate exam 'AAT'. Only then you will be eligible for Roorke and Kharagpur.

Dear Lovejit,
Please go through this link to predict college & branch:
https://www.resonance.ac.in/reso/news/JEE-Main-Branch-Predictor.aspx
Rank predictor :
https://www.resonance.ac.in/answer-key-solutions/JEE-Main/2017/jee-main-2017-rank-predictor.php
Thanks.

It's better to check the official website of DY Patil College. As a whole, it does accept JEE Mains Paper 2 score, but checking out the website is the best option.

There is a counselling process organised by JoSAA under MHRD directive. You need to appear for it. Select the desired colleges as the option and wait for admission dates. Before, that I'll suggest you should go for a few college predictors like Shiksha College Predictor app and research about the institution you get and then choose from there.