Replying to My education

sorry but this is going to be a long thread. thanks to anyone who sticks around and reads it all and makes a useful reply.

so currently i am at this private school and i have been going there since grade 3. in the highschool, they introduced a program called ib. im in grade 10 and this is the first year we are doing it. some of you might know what ib is in which case great. for others who dont ill explain. its basically a program that focuses on the 5 core elements of education-language, maths, sciences, english and fine arts. this school i go to is quite expensive and has been quite an invest for my parents over the past years. anyways, i sort of have an idea of what i want to be in the future, which is something to do with graphic design. specifically something i am interested in meaning, skiing or biking. ib doesnt really facilitate what i want to be because there are no courses that really help with any of that. of course if i move schools to a public school, they have many more specific courses in what i am interested in. the problem is my parents are strong ib believers and i am having trouble convincing them that a public school would be better for what i want to do. any suggestions on what to say? thoughts about this whole sitution? and please post if you have something thoughtful but if your going to say something like "dude that sucks" then dont post. sorry for punctuation, and spelling, i didnt want to waste time on that.

ps. going to a public school would allow for more skiing time as at my current school i only get home at 4pm everyday.
THANKS AGAIN!