Mother won't let me move for school

I'm 17, 18 in October. Where I live the school year is January - November anyway I dropped out at the start of grade 11 and I regret it. I'll be 18 at the start of the next school year and I found an adult school to do high school but it's a 3 hour drive. I told my mother, I'll find an apartment and come home some weekends and school hoildays and she's flat out saying no. Can I apply for the school when I'm 17? Enrolments open in August. Like I'll be 18 when I start. Has anyone been in a similar situation? Having to move away at 18 for school but mother won't let you. This is the closest school. I just don't know what to do, I want my high school diploma and go on to college.