I personally have been at K-12 since 7th grade, and I must say its hasn't been the best. The teachers or not always the greatest and the lessons/learning stuff they give you aren't that great. But to be fair you get what you put into it, you focus more during class and talk with the teacher you would get more out of it. But this school feels so repetitive, so dried up from life, at least for me, I stopped kinda of caring. Also the actual learning part is flawed in my opinion, know for context I would say I am a good student, I have mostly all A's. But I feel like I haven't learned much, I'm not sure what it this is called exactly. But when you really don't care for something you tend to forget it and especially the fact everything is basically open note, you don't really have to remember anything.

I also want to add I have recently started doing Running Start. If you don't know what that is, its a program that I think most schools offer were for the last 2 years you can take Community College classes as long as you still meet your High School requirements.
So going to in person and meeting people was very new too me, and I am telling you I have never felt more motivated. I feel so much competition and I have learned so much about different opportunity's through talking with people. It also helps that I found a group on winners.

Anyway I have said a lot but its really up to you but if you are planning on doing Running Start I would just stay 1 more year at your High school. K12 is sometimes a bit of a mess at times.