I am also a junior three student. I don't think it is necessary to buy materials for China people. Know modern Chinese, recite classical Chinese poems, and recite classical Chinese texts, notes and translations. The composition is only accumulated at ordinary times. I suggest you read a composition every night, accumulate materials in your life, and pay attention to flexible use.
In fact, Chinese lies in ordinary accumulation.
If you want to buy information, you can buy "the finishing touch in class". This time we will have an original question about the exam "the finishing touch in class".