Hello aspirant,

Yes, there is CSAB round in 2019.The candidates who were not alloted any college in all seven rounds are eligible tp participate in CSAB.And a seat allotment will be based on JEE MAINS merit, vacancies and reservations.you need to register in official website using your application number and password.Here is the detailed information about CSAB 2019 kindly go through it

https://engineering.careers360.com/articles/csab

I hope this is helpful to you.