Your 16.. Of course you hate school.
I'm not too happy with the OP system here in QLD (thats in australia) mainly because its very very broken. Basicly, all your grades in grade 11 and 12 as well as the mark on the big bad test are added up. Then you get a number between 1 and 25, 1 being the best. When you send away you uni applications they look at your OP, and if its low enough you get in. This is a simple way of explaning it but you get the idea.
The bad things are stuff like. Your OP can be changed by other people in your school. So say for example, Jeff gets an OP 1 but everyone else gets an OP 20, Jeffs OP will be taken down. Sounds fair.. What??
Now I can't say if this is true but what what I have heard from teachers, students and myself, diffrent subjects weigh diffrently on the OP scale. If one person got all B's in subjects like advance maths, physics ect, he would (I think at least) get a higher OP then someone who got all B's in 'arty' subjects like Drama, Dance and music. In grade 12 I dropped doing math (yay loophole) in order to do music via distance ed. I think this is the reason I got such a bad OP.
Last of all. The OP you need to get into uni is very, very stuffed up. There was an art course at a private collage a few years ago that only 4 people applied for. These four people all got an OP of 1, becuase of this the OP requirement for the next year was 1, that year no one got in so the OP went back to 25. What a mess.