If the above is true, it is not a result we want. Boys normally "really" start to work hard in high school and upwards, and they can have better results than girls. So it is really not good to divide secondary schools into EMI and CMI. It may be better to divide schools into boys and girls schools so that they can be taught according to their development stages.
Boys and girls are born to have different skills and characters, with pros and cons, we are not born to beat each other, but more to compliment each other. Father and mother are both important to a kid, boys and girls are both good, the more important thing is to provide a fair and balance environment for both sex to grow and develop, contribute what they are good at to their best. It is only a tragedy if we suppress the strength or rights of either sex, such as in the middle east.