Houkago no Idol ni wa Himitsu ga Aru

From Yen Press:
Hizashi Hiruno, a freshman at a super-elite high school, has just finished his first academic proficiency test of the year. He anxiously awaits the results, which will set the tone for his next three years at school. But due to a mistake on his answer sheet, he receives an abysmal score and gets sent to remedial lessons! If there's one silver lining, he’s not the only one and his comrade could be the girl of his dreams.