Hello,
I would like to warn you about the situation at COSEVI office in Barva if you want to get Costa Rican driving license. The office only provides this service on Tuesdays and Wednesdays from 7:00 AM to 11 AM, doing only about 15-18 people per day. For few weeks at least the office is unable to satisfy the demand and you'd better to be there at or before 3 AM. When I was there, the first people at the queue were there from 10 PM the day before. You wait outside the fence, beside the road. Bring an umbrella and something to sit on. There were people sleeping on a camping mattress. Do not waste your time - if there is more than 18 people before they open, go home.