Many students with good grades will overcome "digression" and "difficult problems" after class. This kind of love war is helpful to the finale of the senior high school entrance examination, but in general, it is a waste of time and not worth it.
Doing off-topic questions may bring students a sense of accomplishment with good grades, but once they can't do it, it will also hurt students' self-confidence, thus affecting the review of the senior high school entrance examination and the exertion of the examination room. This practice is neither good nor necessary, let alone advocated. It seems good to analyze some other people's learning methods, but they don't conform to their own personality characteristics and study habits. Accept them completely and change yourself temporarily, which may bring learning discomfort.
In the face of all kinds of complicated information, parents and students must keep a cool head, not panic, not blindly follow, carefully analyze and study, consult in many ways, and trust teachers, so as to ensure correctness. It is best to choose what suits you.