The composition of the senior high school entrance examination is all poetry, and the style is not limited. So I should have no problem writing the script, right?

Of course there is no problem, but there is a problem. If you want to write a script, it is difficult to get the ideal score unless you are particularly excellent. Generally speaking, the questioner wants you to write a narrative, an argumentative essay, a short essay and so on. Narrative, in particular, is difficult to get rid of doubts, but as long as it is written carefully, the score will not be too low. It's up to you to be steady or innovative.