Preranu,

There is no separate Advance for Barch ! If one wants to be in IIT'S for architecture !

He/she have to clear JEE MAINS PAPER 1

Then advance . After that there will be a iit level test named as AAT . After crossing all these hurdles you will get IIT for Architecture

Else if you want NITS SPA CCA ETC. then you have to clear MAINS PAPER 2 only ! Then according to your​ AIR you will get college .

So for a general category student you need to get percentile of 89.73 to qualify for advanced of jee mains paper 1 then you have to clear jee advanced then you have to clear AAT then you will get IIT.

Hope you understood