My principle has always been to get the moon first because the children are learning English in Fern, and their family also has primary school content, so they study math together. My child is in fourth grade. In the past, it was difficult to do problems. I told it many times every time, and I knew it at that time, but I still couldn't do it afterwards. Then I thought I might as well find a teacher. After studying for a while, I have made great progress on the whole.