Any method of reaching out is good, but if class is in session profs usually have posted office hours (hours where you can visit them and talk about the class). In my experience (long ago) they tend not to get a lot of visitors, so if you can, doing it in person might not be a bad idea. Of course being in high-school limits the time available to do this..
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You can ask. The worse they say is no.
Not clear what you are looking for.
Any method of reaching out is good, but if class is in session profs usually have posted office hours (hours where you can visit them and talk about the class). In my experience (long ago) they tend not to get a lot of visitors, so if you can, doing it in person might not be a bad idea. Of course being in high-school limits the time available to do this..