In fact, there is no need to buy a Chinese workbook. Just read more books. For mathematics, you can buy some auxiliary teaching materials for synchronous teaching, such as "How to Learn Mathematics in Primary Schools", and be familiar with the questions, so is entering junior high school. English, in today's society, has higher and higher requirements for listening and the expansion of new words. Master grammar well in school. Then buy some listening exercises (not synchronized with English books) and some English reading questions to expand your knowledge. That's good. I believe it would be nice to enter junior high school.