Architecture

https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=6375912
Hi bro you can check your chances of getting an NIT from this link. This rank predictor tool is based on previous years data. Hope this will help.

Try JEE college predictor to Predict engineering College you can get on the basis of your JEE rank. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=cconnect&utm_medium=CR_JEECP&utm_campaign=4067795.

Try JEE college predictor to Predict engineering college, you can get on the basis of your JEE Rank.
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=cconnect&utm_medium=CR_JEECP&utm_campaign=4067795

Mostly, you won't get a seat in NIT Trichy as last year's closing rank for Other state quota was 831. If you are Tamil Nadu itself, you might have a chance. You can check last years opening and closing ranks here - https://josaa.nic.in/result/result/openingclosingrank.aspx.

If you want to get an NIT, then your marks should 250 above.

There is no specific dress code. But I suggest you to don't take these things along with you in exam :
First of all, all types of electronic item (wrist watch included). No stationary (No pens, no pencil). No belt, so wear tight pant. T-Shirt with some Design on front and back. Any type of bracelet. Biggy shoes. Any water bottle. (But I take a cold drink bottle along with me)
Purse.

Yes, NATA is also related to B.Arch paper. It will be for 1 year entrance in any colleges.

Yes, its better to write NATA test along with B.Arch. It will be an opportunity for 1 year architecture in any college.

No, its better to go to Dubai for paper 2 in JEE Mains after scoring high rank.