This mainly depends on the usual efforts. Focus on reviewing the books of grades 4-6 in primary schools. Focus on reviewing Chinese and English in the subjects. Chinese often recites ancient poems, and texts can be omitted (this is generally unnecessary because junior high schools rarely recite texts), but words must be mastered, including extracurricular ones. English words should be memorized, with emphasis on grammar. Besides, I don't know if this is the case in your place, because social and ideological subjects are added to junior high school, so junior high school exams will take history and current politics to see if you pay attention to national affairs. I suggest you look at some current events, such as the South China Sea crisis, the Syrian incident, the London Olympic Games, and of course some history, such as reform and opening up, a well-off society (this is the content of grade eight, and our school was admitted to junior high school this year) and some modern history of China. Science may test some common sense questions.