Then listen to the teacher's method of doing problems in class. In fact, in the final analysis, it is a question of method and thinking.

For example.

You set up a coordinate system and drew a graph. Originally, this figure was to be drawn above the X axis, but you drew it below the X axis.

Now you want to change, what should you do? I think most people will erase the graphics before drawing. But some people will clean the X axis and draw it under the graph.

Some problems can be started from many aspects, and some problems can only be started from one aspect.

Mainly to accumulate problem-solving skills and do more. Seeing this problem, you will probably know how to start.

Sometimes you can't think of a question. Don't limit yourself to one knowledge point. Try other methods. Of course, most of the time you still get nothing. But don't be afraid, as long as you have enough time now, you'd rather try to do the problem from multiple angles.

The exam is coming, and it's time to do the problem, that is, do it every minute.

The second question I'm talking about is that you can know what method to use at a glance, and you can do it at once, so that you will feel better when the exam comes.