B.Arch

Sorry to say but 198 is not enough for you to get a good college for B.Arch. Above 300 is considered as a safe score to get admission in B.Arch. However, you may get private colleges with 198 marks.

Yes, you will get admission in NITs. I am not sure about the NIT but you have advantage of OBC quota and 4.5k general rank.

We accept only NATA score for B.Arch.

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.

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.

Hello Rohith,
There are 9 NITs which are offering B.Tech archs programmes. Admission in these is based upon rank in JEE paper 2. You are suggested to find your rank as you have got 207 marks. Follow this link to know about the cutoff ranks by NITs :-
http://www.motachashma.com/entranceexam/200808/nit-barch-cut-off

You can check your eligibility for the colleges here:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor