IIT

For OBC - NCL students; if family annual income is less than 4.5 or 6 Lacs (not sure ) then you can get nearly 50 % scholarships in tuition fee. For more details regarding scholarships you can visit national scholarship portal on internet.

You can report at reporting center also. After that, you have to report at admitted college within the given time. They may give you 3 - 5 days for reporting at the institute you got.

Within 3-4 days or hardly 5 days. You will get information regarding it on provisional seat allotment letter.

Hi,
For computer engineering and IT
This may help:
https://www.shiksha.com/b-tech/ranking/top-computer-science-engineering-colleges-in-india/46-2-0-0-0

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.

Hi,
You can click on the link mentioned below and can get all the information regarding cut offs as well as admission procedure.
All the best.
https://www.shiksha.com/college/fergusson-college-fc-fergusson-college-road-pune-25748/admission

There are less chances to get IITs but perhaps new IITs might admit you.