Hello dear
You can reach the official site of csab where you can get all the details about the vacant seats ( college ; branch and in which category how many seats vacant).
Here I am providing you direct link.
https://csab.nic.in/cms/Public/Home.aspx
Click on tentative seat vacancyfor csab special counseling 2019 .
Good luck

Hello aspirant!! To view vacant seats please do visit the official website of JOSAA and click on seat matrix. Hope this helps you!!