Hello Haneef,

There are 3 documents issued after passing 12th class. One is the original marksheet, passing certificate and finally the migration certificate. It would be safe to have all these with you when you go for counselling. Apart from these the provisional JoSAA Seat Allotment Letter 2020, a valid photo Identity Card, original JEE Advanced Admit Card 2020, proof of Seat Acceptance fee payment ( the e-challan ),proof of Date of Birth , category Certificate (if needed) and the registration form with Locked Choices are some other important documents need for counselling.

You may use the below link to know more about the process:

https://engineering.careers360.com/articles/josaa-counselling

All the best