Hello,
You have to appear JEE Main paper2 to get an B.Arch admission only. Paper 1 is for engineering. There is separate counselling for engineering and architecture. Some colleges do counselling at the same time.

You won't get B.Arch using paper1 JEE main. You can go for engineering counselling using paper1.

to know the list of colleges you can join for engineering visit the site:-

https://engineering.careers360.com/jee-main-college-predictor

Good Luck!