Ironic with a capital I

Why is it that sometimes in the first marking period that your worst subject is your best grade? It makes absolutely no sense at all. I just have checked my grades online and my math grade is through the roof. I'm passing with a gorgeous 97 and my favorite class science is a measly 80 which is a C at York Catholic. There is no logical explanation for this. The ironic part of this is that yesterday I received my English test back and I had a 93! Which is sooo amazing!