Supplement: You can directly apply for a foreign university, and the intermediary agency can go out after completing the visa. Generally, it takes six months to one year to study, mainly to get familiar with the environment and language. I hope it can help you ask: this requires taking math exams and other things besides English. Answer: No, he just needs his usual grades, such as mid-term and final exams. Because there is a credit system in foreign countries, he should ask according to these converted credits: Will I be unable to keep up when I go to college in my sophomore year? There is also the meaning of preparatory class. Answer: No, domestic courses are much faster than those abroad. You know yourself better than them, and, to tell the truth, we are smarter than them. Preparatory course is an adaptive study there, including the way of class, language exchange, lifestyle and so on. It is an adaptive process, about six months to one year. You don't have to worry, there are many people going out in the first year of high school. But you'd better ask the intermediary company in detail. After all, I'm just experienced.