Hi dear ,

              May be you can get civil department with this rank in JEE mains OBC- NCL category.Admission and courses in colleges accepting JEE main 2018 depends on rank of the candidate and cut off of the institute and cutoff of the courses based on JoSAA. These institutes include NIT's ,IIIT's,GIFT's and other state government colleges and universities accepting JEE mains score. 

You have good rank in OBC category so you are  eligible to get admission in civil branch thus you can get preferred course if you do some research and see previous year cut off ranks different NIT's .

All the best.