Dear Aspirant, cut off for 2020 JEE advance has not been released yet by the authority. The cut off will depend on several other factors:

Previous year cut offs.

No. Of seats offered in courses by institutes.

No. Of candidates appeared in JEE advance 2020.

Difficulty level of entrance exam.

For better understanding of how cut offs for 2020 can be set up  by the authorities , here is a  glimpse of previous year cut offs.

For 2019 .(Assuming category : General)

Course                                          Male.    Female

Biotechnology.                             7566      9982

Chemical engineering.                4384.      8140

Civil engineering.                         5261.        10384

Computer science.                      412 .          1386

Engineering physics.                   4069.        7726

Mechanical engineering.            2748.        6615

Metallurgy and material eng.     6607 .      11832

Polymer science.                          8365.        11369

Electrical engineering.                1856.         4274

Electronics and communication engineering

1198.        3109

Production and industrial engineering.

5235.        9247

Architecture.                                17756.         19658

For year 2018 cut off marks .

College.                    Opening rank.  Closing rank

IIT Roorkee.               3268.                   4756

IIT guwahati.              3748.                    5890

IIT Gandhinagar .       3747.                   7542

For more information and better understanding of the cut off marks in various IITs you may click on the given link.

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-advanced-cutoff-for-iit-roorkee/amp

https://www.google.com/amp/s/engineering.careers360.com/articles/iits-cutoff-for-b-tech-civil-engineering/amp