Generally, colleges and universities don't allow students to change the topic of a paper in the middle, because changing the topic of a paper means that you need to re-conceive and find information, which will waste a lot of time, so try to determine the topic before writing a paper.

Of course, there is one situation that can be ruled out: that is, the tutor suggests that academics change a more suitable topic according to their own papers and the framework and content of the papers.