Coaches can decide to start with the complex ones as well as the simplest ones, depending on his choice and the students preferences. Simple to complex would make the class somehow simple and interesting but not intriguing and serious. In fact, some can be easily distracted as the course would appear too simple.
Starting from complex to simplex would make the class very intriguing and catchy. But only few would be carried along in this situation.
Starting from complex to simplex would make the class very intriguing and catchy. But only few would be carried along in this situation.