I know the best high school is the middle school attached to Inner Mongolia Normal University. In Hohhot, as long as you get good grades, there is no problem, otherwise you have to choose a school.

If you are in Baotou, you are in Baotou. Not bad either.

It seems that Erlian is only awarded to junior high schools and senior high schools, and Erlian has classes for Mongolian students in Mandarin, which is very easy to enter.

I don't know anywhere else.