Personally, I don't think it's very useful to attend, because if you want to buy an outline, all the key points will be listed on it. You just need to recite the paragraphs in alignment according to the key points. When you go to cram school, his final result is to let you recite it yourself, but he shifts the focus of the outline to Chinese to explain it to you. I don't think it is necessary to spend this money. Of course, everyone's situation is different, and we still have to judge for ourselves.