Canon in Canon is divided into three volumes: A, B and C. Volume A is the basic content, volume B is the consolidation and volume C is the improvement. Mathematics and physics, in particular, are difficult and challenging, which is very helpful for improvement. But there are not many questions, the key is to improve the ability and require a good grasp of the foundation.
Each has its own advantages, which should be determined according to its own learning ability and conditions. If the foundation is not good, use "five". If you have good grades and need to improve and use your knowledge flexibly, you can choose Canon.
I hope I can help you. (* _ _ *) Hee hee