try to find classes that really start to interest you, rather than just taking the "core" classes and all that shit, unless that is of interest. Some you will have to take in the end for requirements, but with a little effort, especially in the last half of high school, your curriculum can be tailored to your needs/wants more than most think. See if your district has intradistrict programs and offerings at local colleges. It could really expand what you can take, and if you can take college classes in highschool, they're generally easier than that AP bullshit and you can start accumulating a ton of credit before you even step into a university out of high school (if you go to college afterwards that is).
I did pretty much all of that, came into university with only about 50 credits, but that alone meant I didn't have to take bogus classes freshmen year, instead I took what I wanted, essentially never went to high school campus, and got to ski a shit ton.