You are only a sophomore now, and you want to study major because of your poor grades. I think you should think it over. At present, art is not very studious, the college entrance examination competition is fierce, and employment is not very simple. I think it is possible to improve your grades before the college entrance examination as long as you are willing to study hard, work hard and master some learning methods. Here are some suggestions for you:
Chinese: reciting+doing problems. Don't ask for more, remember wrong again and again. As for composition, it is good to have your own creativity, but it is even better to combine some classics. It is suggested to recite some classic paragraphs and famous sayings. For example, you can record the classic paragraphs above "readers" and use them when writing. English: A sense of language is very important. Read more and recite more. Look at grammar properly, do more questions, and find answers to explain detailed counseling books. Math: Method is very important. To sum up your own answer methods, you can buy a tutorial that explains this method more. Doing math problems is the most taboo. If you look at it, you will make a mistake. So do more questions, don't be eager for quick success in the exam, make sure you are doing the right thing. Master the appropriate learning methods. Many students are fragmentary knowledge points in physics and mathematics, and have no unified and integrated knowledge. It is necessary to string these knowledge points together and put knowledge blocks and knowledge systems together. Remember more comprehensive literature, strengthen basic knowledge and do more exercises.
You are only a sophomore now. As long as you work hard now, you can still get into a good university. Many high schools study hard in the high school stage, and their grades are still improving rapidly. I met a student in Meng Ping who used to get average grades. Later, under the guidance of his teacher, he made rapid progress and scored well in the college entrance examination. I hope my advice will help you, and I wish you success in your studies!