SMEAT

If you get a seat in the special round, then your last seat will get cancelled. If you don't get any seat then your last will be retained. I don't know whether it will affect a seat of IIT or not as you can go for counselling of both.

IIT is not there in the special round, it is only for NIT and IIIT. Simple, you have to visit CSAB website the after 7th round and keep checking for the registration updates. Registration and choice fill up is similar as JoSAA.

Please use the college predictor tool by Shiksha. This will help you to predict the college according to your rank/percentile:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Kindly visit this link:
https://www.shiksha.com/b-tech/resources/ap-eamcet-college-predictor

Hello Sachin Lodhi,
There is a provision for supernumerary paid seats (not exceeding 10% of the total number of seats) in certain courses, the details of which will be available at the time of admission from the concerned faculty/department. The desirous candidates are advised to keep constant touch with the faculty/department for knowing the detailed position regarding the process of admission under paid seats in the concerned course.
Click on the link for more details:-https://www.quora.com/What-is-the-Paid-Seat-system-in-Banaras-Hindu-University-BHU.
Thank you.

Yes, there are chances to get a seat in this college, so you can apply for admission.
Good luck.

I don't think you have any chance of getting NIT-Goa in JoSAA rounds.