Langrage skill requirement is very high and the curriculums are intense throughout the program (Grd. 9 -12). Student needs to be well self-disciplined in order to success. An average level overseas student will have a hard time to survive.
However, if the kid is already outstanding by Chinese standard back in China in all courses, then he / she still will have a chance. There are a few kids (in grd. 12 now) are doing very well after only being in Canada for three to four years.