Is it expensive to pay for the chemistry class on a clear month?

Not expensive. According to the information of official website, the paid chemistry class of Qingyue's sister is not expensive in 200 yuan, so you can go to the chemistry class of Qingyue's sister in bilibiliUP for consultation. Sister Qingyue is a famous chemistry teacher in the whole network, and she has hit the exam questions many times. Both of her masters graduated from Beihang University.