your school leaving exams or next school will probably not care
and they will test whatever they want, so why take a risk?
you can be challenged by a task which is doable in both methods, but "recommened" approach needs 3min in order to get this done,
meanwhile your's solution needs 15min. I mean here that standarized tests aren't some kind of trickery, they just tend to test how many various approaches do you know.
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also how many times can it be done? (deciding that it's ok to use other/easier method instead of "state of art" solution) once? twice? thrice? very often?
There are many situations where there are multiple approaches to a problem and none of them are more "correct" than the other ones.
> but "recommened" approach needs 3min in order to get this done, meanwhile your's solution needs 15min
The point is that what if the recommended approach takes someone 15min, and a different approach that they understand better takes 3min.
I see the role of a teacher as someone who helps you learn, rather than someone who only teaches you things.
If a student finds a particular method or approach easier to comprehend, shouldn't the teacher adapt to that rather than forcing you to use the "correct" method?
If a teacher is dogmatic in their approach, I would call that poor teaching.