The Most Awesome Teacher in the History of Rebirth

[Rebirth + system + campus + with CP] Zhang Daguo, a scumbag who died in the ICU in his previous life, activated the star education system after waking up. Zhang Daguo: "What? I actually became my class teacher (Zheng Biwen)!" Principal: "Young teachers, you should learn more from the experience of your seniors! Our teacher's duty is to educate, not to play with students!" Zheng Biwen: "Principal, in this exam, our class must be ranked first in grade!" Principal: "I asked you to be the class teacher, but I didn't ask you to teach all subjects!" Principal: "What? 100% Excellence rate in a single subject?"