Expectations...

I’ve always hated science and maths; somehow I managed to get into the top set. I find it difficult and boring, but my teachers think I’m smart and really push me to the point where I don’t even want to be in this set anymore. They raise their expectations so high. I know they’re supposed to do that but I don’t want to be pushed like this. I consistently achieve a C and I think im better suited to the second or third set. So when I confronted my maths teacher with this he thought to have a parental meeting to move me down. My science teacher said my book work is bad which I agree with. I’m in year 10, I’m happy with passing science and maths with a C grade. They don’t think that. How can I lower their expectations?