Tsubasa is ordered to score high on exams, so when the lovely Rena offers to tutor him, he accepts. He soon realizes that Rena expects a reward for her help. Minami spots them together and is thrilled at first, but then starts to feel very uncomfortable.
The stuff from the math 
quizzes and elevational zones
المسائل من اختبارات الرياضيّات القصيرة
والمناطق المرتفعة
Die Aufgaben vom Mathe-Kurztest
und die Höhenzonen aus der Biologie
As questões de matemática
e sobre as zonas elevadas de biologia