Let's Look at the Sky Sometimes(1990)

Hye-joo and Eun-kyung vie for 1st place in school. Tae-ho, who's tormented by his parents who incessantly nag about grades, has a crush on Hye-joo. The two girls begin an earnest struggle for the top score as they prepare for the final exams. But when Eun-kyung sees Hye-joo, who's been too sick to study, cheat, she becomes indignant.