The wrong problem set is for you to solve problems. Most of the wrong questions don't need to be summarized in the wrong set. Try to solve these mistakes (especially if you don't understand, you must understand).

The wrong problem set needs to summarize typical mistakes, such as:

1, multiple solutions to one problem, ignoring one situation.

2. The calculation related to the set ignores that the numbers in the set cannot be equal.

3. The triangle only considers the acute angle and ignores the possibility of obtuse angle.

And so on.

There is no need to summarize the impossible things in the wrong problem set (it is too difficult to ignore), but it is especially necessary to spend energy to solve them as soon as possible (if you are flexible in thinking, summarize them in another "good problem set").

Wrong problem sets remind you of typical mistakes, and good problem sets help you summarize and sort out typical problems.