As at primary school, lessons at Gymnasium begin at 8 am and continue with short intervals until lunchtime or early afternoon, with children returning home to a late lunch. Older pupils often attend further lessons after a break for lunch, generally eaten at school. As at primary level, all pupils follow the same plan of work. Great emphasis is placed on homework and frequent testing. Satisfactory marks in the end-of-the-year report ("Zeugnis") are a prerequisite for moving up ("aufsteigen") to the next class. Pupils who do not meet the required standard re-sit their tests at the end of the summer holidays; those whose marks are still not satisfactory are required to re-sit the year ("sitzenbleiben").