Mathematics 140 and 120 are excellent and medium level, and the difficulty of mathematics is relative. It depends on what level you have learned. Some people learn mathematics by analogy. Then they may get full marks, so it is not difficult for them to get 140. However, some people can't even understand the exercises in the textbook, let alone draw inferences. Naturally, it will be difficult for them to get 140, so it cannot be stipulated by certain standards.