Chances are less but as you have mentioned that you belongs to SC category so it can be possible that you get a seat.So,i would recommend you to fill the preferences as per your interest.If your rank will be enough than you will surely get a seat in any of the college and branch filled by you.

Today you will get the mock seat allotment as per your preferences filled.

To know more about josaa counselling 2019 refer

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

Thanks.