There is not much difference between intensive classes and basic classes, which are basically intensive lectures on knowledge points and explanations of typical topics. However, if the intensive class is not in the summer vacation, the class for nearly half a month will greatly affect your review progress and disrupt your review plan. Is it necessary to think it over?
The time of problem-solving class is relatively short, generally only about two days.
Master Wendeng's Review Guide and Problem Essentials and Exercises are both classic, and the postgraduate entrance examination is generally manual. It is recommended to buy. Personally, I think reading these two books is better than his class.