If you can learn the knowledge in class well, (including exams, homework, weekend time allocation) can be considered. After all, those so-called questions are carefully selected by teachers who have studied and thought.

However, extracurricular classes may not be suitable for everyone. For example, I like learning step by step, so I can use the weekend time to find my own questions, such as the only-class middle school exam of series 53.

In a word, knowledge is always the same. Self-understanding is the main purpose. Extracurricular classes are auxiliary tools, depending on which one you are suitable for:)