It's all about experience, trying out what works, what doesn't, a few times you come across and then find a system. Each teacher solves it his own way, so it is wise to observe different methods and then take the best out of it. At the same time, it is probably important to distinguish the subjects. Some relief may be required somewhere than elsewhere.
Each teacher solves it his own way, so it is wise to observe different methods and then take the best out of it.