Driving Schools in Japan

My son, a high school student, got a letter from his future work place. The letter said he should get driving licenses for both ordinary cars and motorcycles. I thought he's going to go go driving school in April after graduating from high school because his school doesn't allow to go to driving school until then. He have to get a special permission for go to the school.
Unlike other countries, the cost of attending driving school in Japan is really expensive. It costs around 300,000 yen for a normal school. But you can go to one at a cheaper price if you could go to some intensive camping schools usually in remorte areas. It costs around 230,000 yen including a dorm and meal fee. Don't you think it's ridiculous?