Interesting idea but math educators put a LOT of thought into what should be taught and how to help students understand. If you don't understand polynomials then you're going to be extremely limited in terms of what kinds of probability problems you can solve. Calculus is also used in statistics very heavily. "I will NEVER need to do that!" you say? Well, how sure can you be, and how many people say that and change their minds? Teachers can't just take everything at face value. They try to educate you up to a level that won't leave you in a bad spot if you want to continue some day. Learning about polynomial factoring never hurt anyone. There are lots of basic problems you can't solve without knowing how to do that stuff. You can self-study less difficult things on your own, as well.