According to the 2021 cutoff trend, the required cutoff of CSE for OBC category students is 14577 (HS). If you are an out-of-state student then the cutoff is 3779. So, getting admission to the institute will be tough if you are not a resident of Goa. 

The counseling process is done based on the AIR and not the category rank. The category rank is just a measure to rank you in your particular category. If your category is OBC NCL then your category rank would be the position among the other OBC students who had appeared for the examination.