They are Japanese traditional method of sorting academic course,
“Rikei” means some kinds of ancestry of natural science and “Bunkei” means some kinds of ancestry of social science.
In my school days, I also chose one course without doubting this senseless system, because I didn’t have a skill to distrust provided system from others or history.
This system easily fill the students’ mind with preconceived notion. It is because almost adults surround them have no awareness of this falsity.
Therefore, if we want to make a revolution to the education system, at first we have to change parents mind of students.