1. School's academic system and curriculum arrangement: Different three schools have different academic systems and curriculum arrangements. Some three schools may have a 2+ 1 academic system, that is, two years of high school courses plus one year of college preparation, and some may be other combinations. So the exact time may be different.
2. Students' learning ability and hard work: Even as students from three schools, it is still necessary for students to have sufficient learning ability and hard work to enter the university. They also need to study high school courses and cope with the college entrance examination, which requires extra efforts and time.
3. College entrance examination results and admission requirements: Whether you can finally enter a university depends on the students' college entrance examination results and the admission requirements of various universities. Even students from three schools need to get high enough scores to meet the admission standards of universities in order to be admitted smoothly.