(Wilma is a Finnish education website that keeps track of students, their grades, homework, timetables, behavior in class, etc. It's very useful for teachers and also helps students remember homework and tests. A "stemppi merkki" is a green mark that you get for being active in class and doing well. Different colors mean different things. For example, brown, also known as "kakkaläikkä" among students, means that you have behaved badly and disturbed other students during class.)