When we were students, we couldn't avoid making spelling mistakes when doing homework. At that time, there were two commonly used methods to deal with it: one was to use correction fluid to cover up the mistake and continue writing on top of it. The advantage of correction fluid is that it is convenient, but the disadvantage is that the traces are too obvious, with blotches that can be seen at a glance.
The other method is to scrape off the wrong word with a knife or remove it with tape, which is a form of physical elimination. The advantage of scraping off (or removing) is that the traces are not obvious. Those with good skills can even make it look like there was no mistake at all. The disadvantage is that it is relatively costly, requires high technical requirements, and if you're not careful, you may damage the paper, losing more than you gain.
Of course, there are two other less commonly used methods: one is to directly replace the entire sheet of paper, and the other is to cross out the wrong area and continue writing next to it. Responsible teachers generally prefer the latter method, as it allows them to see the students' thought process and facilitates correction.
However, as students, how can we understand the teacher's good intentions? After making a mistake, all we think about is how to conceal it and try our best to avoid letting the teacher know - perhaps to maintain our self-esteem, fearing that the mistakes caused by "insufficient intelligence" will be discovered.
Note: Thoughts on the recent sense of magical reality.