You can practice the words you think are not good. There are three main points in this exercise.
First of all, we should observe the strokes, stroke order and structural arrangement of words, and then imitate them;
Second, during the practice, you should always stop to see what is the difference between your writing style and copybook, and then make further corrections;
Third, we must have a correct judgment on the exercise. For example, sometimes if you don't advance, you will retreat. Then you should know that this is a natural law, and so is the so-called "advance and retreat". Sometimes I find that some strokes are difficult to practice, perhaps because there are many differences between you and copywriters in temperament, habits or aesthetics, so there is no need to force them. The purpose of practice is to improve. If improved, copybook is just a tool.