The child is in the fourth grade and wants to learn Olympiad Mathematics for him. He often receives short messages from Zhuzhou Giant Education. What is the teaching effect there?

I heard it was ok. I have a friend's child who is studying olympiad at Giant School, attending a large class, in the campus of Tianyu Hotel in the south district. The effect is not bad. According to my friends, my child has never studied Olympiad before, nor has he signed up for any class. After studying for a semester, the child offered to learn. Teachers often call their parents, which seems to be quite responsible.