Should I move now, or wait until I finish high school?

This is a difficult question.

Spending one week somewhere is nothing like living somewhere. At the same time, I do think sometimes we just know a place is right for us, a good fit. The kids might be different once school starts as they clique up.

If you move will the new high school suit your needs? I would research that a little since the majority of your time is spent in school. Some schools are very inadequate. For instance if your curriculuum has a specific focus like international studies, performing arts, science, or some other electives offered at your current school, it might not be offered at the new one. Or, certain sports.

If your mom can move easily, then in a way I think go for it, you can always move back if you wind up not liking it.

A compromise might be spending summers there.

Are you planning to go to college?

I would say, stay. Finish high school and then when everyone is going in different directions anyway the transition will be easier. @JLeslie is right about spending a week vs full time. Enjoy your friends now and make the move in a couple of years.

Do what you want to do!

Two years is a drop in the bucket.

Wow, it depends. Two years is a long time. I think if you really want to move, you should do it now.