1 Subjects: “...middle school...”

2 Subjects: “...high school...”

3 Subjects: “... Forschung, Test, Rasch Analysis, Explorative Studie, Instruction in natural science subjects, Primary school...”

4 Subjects: “...elementary school...”

5 Subjects: “...secondary school students...”

6 Subjects: “...after-school exercise...”

7 Subjects: “...school response...”