1, according to the query of 360 personal libraries, the general contents and requirements of all subjects are the same (the general contents of primary schools with two academic systems are the same, and the general contents of junior high schools with two academic systems are the same). If you transfer from junior high school in September, you can do both; If you transfer halfway, you can transfer from a three-year junior high school to a four-year junior high school at any time; Conversely, four-year junior high school students must be downgraded to three-year schools; The reason is that the three-year junior high school has a faster learning progress, while the four-year junior high school has a slower learning progress.