English will kill everyone, which is nothing, because everyone dies equally miserably. This is not directly proportional to the English scores obtained in domestic exams. You can't do anything now except recite more words and read more novels.
If you reach the third grade, mathematics will be very simple compared with China. As long as your family is generally good, there is no need to worry about not doing it here. Even if you have been here for a long time, you don't need to learn math. But for you, the most important thing in mathematics is language, right? In fact, don't worry too much, because usually the math in this exam is just to write the answers directly, because the teachers who usually come to recruit students are not necessarily math teachers, so many papers have been corrected in such a short time, and no one has seen your steps. So the most important thing for you is to understand the topic. All you have to do is recite the words and look at the examples. The key is not to remember all the words in one day, because you will forget half of the words you just recited the day before during the exam. So you read slowly and recite a few key words a day. Of course, the more you read, the better, which can help you consolidate the words you have just recited. Then half a month's time is enough to go through all the words that can be used. Even if you can't understand every word in the exam, it doesn't necessarily affect your understanding. There will be many problems when searching for math exercise sec 3 on Google. For example, I found a /students/practice.html, just take a closer look, and half a month is enough.
And your English interview, you'd better worry about it. That's quite difficult. You need to improvise. The teacher may casually point to a painting or something in the office, so let you talk about your feelings in English. This depends on your usual reaction ability. And English listening and speaking. Listening doesn't need to be too good. It is good to understand what the teacher is saying. It's normal not to understand, because I don't understand at all. It is normal that oral English is not good. After all, there are few good spoken English in China, but it may be helpful to learn to tell more stories and introduce yourself now.
If you are going to get a scholarship, and it is not the first time, you can try to contact your former senior sister, which may be helpful.