Dear candidate,
Different colleges and different states have different dates of their counseling and some colleges give admission in btech program with their own test or with jee mains all India rank.

You have to mention specifically that about which counseling you want to know.
For eg : If talking about west bengal then wbjee board has scheduled its counseling for 2020 - 21 session btech programs and barch programs from 12th august 2020, and the whole admission process will end on 28th October 2020 after completion of all three rounds and the seat acceptance process.

Recently, the jee mains results are out and the jee advanced registrations are going.

Now for admission in nits, iiits, or iits, the seats are given on the basis of The Joint Seat Allocation Authority (JoSAA) in btech and barch and b.plan programs.
Jossa counseling will start after the result declaration of jee advanced exam.
The result of jee advanced is scheduled to come on 5th October 2020. And on 6th October 2020 there jossa counseling will start and the whole admission process will end approximately on 13th November 2020.

Check out the following link to get more knowledge about jossa counseling 2020 :-

https://engineering.careers360.com/articles/josaa/amp