Chinese and math are naturally the most important in primary school, but it is best to strengthen English, so that you won't have too much fear when you come into contact with English in the future. You can take a tutorial or something. Relatively speaking, science can be put behind. When the exam-oriented education has not been completely abolished, its position in the senior high school entrance examination and the college entrance examination may be somewhat insignificant. Of course, this is the most conservative statement. If you have the ability, you'd better learn all of them well.