1. There are many advantages in applying for master's degree and doctor's degree. You don't have to do a master's thesis, and you don't have to participate in the thesis defense. You can graduate with a doctorate one year in advance.
2, the school did not apply for graduate students, the master's thesis was formed in the third year, and the research progress arranged by the tutor is not easy to change. Take part in the defense after writing the master's thesis, and then study for a doctorate. There is no advantage in graduation time, so it is better to take the postgraduate exam in the second year.