What classes in college would I have to take if I wanted to be a Pediatric Oncologist? (Child Cancer Doctor)?

Okay I want to be a Pediatric Oncologist, which is a doctor who specializes in Children Caner patients. I wanna know what classes I would have to take in college though. Cause, I don't necessarily SUCK at Math, but it sure isn't my best subject. I'm sure you have to take Math classes, but how many and how hard are they? & What are some other classes i would have to take? Thank you very much(: <3