2. You can get the diploma smoothly, and it doesn't matter if you don't take the college entrance examination.
3. When high school students issue high school grades, because many schools don't put them on record, they don't need to issue them according to the original grades.
4. If it is the major you want to apply for, the above two schools do not need TOEFL scores.
I suggest that you don't prepare materials and certificates now, because you just started learning Korean, and you are not sure when you can meet the requirements of applying for a school. Moreover, all kinds of certificates now have basically expired after the first half of the year, and it is not recommended to do it now. What can be prepared is the replacement of passport and household registration book. At the same time, find a local intermediary that you feel is better, keep abreast of the latest enrollment information and make a good time plan.