Even native speakers make typos.
Even native speakers say the wrong word.
Even native speakers sometimes forget how to spell/write a word/character.
Studying for a test is not the same as learning to communicate.
Scores don’t mean anything other than your retention of a specific set of information and should be used as a progress tracker not and end mark.
Though I’m all for testing and such, it’s important but it’s not the be-all end-all to mark how well you know something, and a lot of it is geared to a specific set of learners who have a very specific learning style.
If you say something and the other person understands you–or they say something and you understand them.. congratulations you spoke in a different language.