The source of students is definitely important, the really good students will go well on their own without the need of a good teacher, I never listened to our math teacher in junior high school before, because the speech was so bad! But the teacher is also very important, for example, my math teacher was not good at teaching math, and then taught us physics, and finally physics for us a rocket class to the bottom of the grade, the principal let him run the lab. My physics then 100 points, 39 points. Junior high school and changed a physics teacher, my physics became more than 90 points, but my physics high school is very painful, the most painful is the physics associated with the junior high school, my high school math and chemistry are the first in the class, only physics, it is difficult to come up!