What you say is often contrary to the general situation, that is, chemistry is usually good for physics, and Chinese is good for mathematics.
The reason is that physics is mainly logical thinking and mathematical processing, while chemistry is mainly the memory and classification of various phenomena, so the former is often more difficult than the latter, and it is not difficult to read more and recite more chemistry.
Chinese is the basis of logic and understanding. If you can't understand the meaning of Chinese without reading, what else can you talk about learning? Poor Chinese, less accumulation, or low IQ. If you accumulate less, you will spend more effort to improve. There is no cure for low IQ at present, let alone math. I can't learn any subjects well. Give up early.
There are many factors for individual differences. Memory, comprehension and logical reasoning ability are the necessary conditions for learning all subjects. The needs of various subjects are different, but they are still interrelated, that is, the intelligence is really limited, and the subjects are not much better. Lameness is often caused by insufficient investment in the front, and there is still great hope for increasing investment.