Billy was 5 years old when he went to primary school. In elementary school he had 4 lessons each day. After finishing primary school, he went to high school. His studies began at 9 am and ended at 3:30. The main subjects in high school were mathematics. In high school Billy was interested in sports. In the 9th grade, Billy had exams. After Billy finished 9th grade, he decided to go to college and study physics.