関連ワード:  is 7th grade the hardest grade    is 7th grade the hardest grade in middle school    is 7th grade the hardest year    is grade 7 the hardest    is 7th grade the worst year    is 7th grade the worst    is 7th grade the worst school year    is 7th grade the worst year of middle school    is 7th grade math the hardest    is 7th grade harder than 8th