Ichiroh! manga

Ichiroh! summary:

From Yen Press: Excited for the bright futures ahead of them, soon-to-be-high school grads Nanako Konishi and her friends Akane and Shino take a college entrance exam. However, only one of them manages to pass! With their failing grades, Nanako and Akane are forced to enroll in a prep school. The two friends begin a new life in a dorm near the prep school, but they find the road to success to be. . . rather bumpy.