do u have to make an appointment if u know u have to drive ?

You only need to schedule a drive test in Lincoln, Omaha & Bellevue. All other Exam Stations are first come first served. You can schedule your drive test at https://dmv.nebraska.gov/make-appointment-class-o-drive-test

You can do your written test but you'll have to schedule your driving test period but you can do the written test without an appointment.

Yes, for driving tests you have to make an appointment.