It is not uncommon for a pupil to re-sit more than one year of school. After completing the first two years, pupils choose between one of two strands, known as "Gymnasium" (slightly more emphasis on arts) or "Realgymnasium" (slightly more emphasis on science). Whilst many schools offer both strands, some do not, and as a result, some children move schools for a second time at age 12. At age 14, pupils may choose to remain in one of these two strands, or to change to a vocational course, possibly with a further change of school.