Hello Charan,

Well as per your rank of 6600 , you will not get the top notch NITs for B.Arch course but there are other NITs where you might be able to take a seat. Below I have provided a list of some of the NITs along with their previous years cutoff for both home state & other state closing ranks - 

• NIT Hamirpur : 11202 (Home State) , 1902 (Closing State) 
• NIT Raipur : 8689 (Home State) , 1977 (Closing State) 

So these are two NITs where you can get a seat as per your rank. The above cutoff is for general category students.

You can also go through this link and checkout the detailed previous years cutoff category wise for NITs : https://engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning

Also, there are other colleges too other than NITs where they accept JEE Mains paper 2 scores.  So you can also try for those colleges to improve your chances of getting a seat.

Hope you get your choice of college. Good Luck !!