Give students more days in School.

I am only 15.
I want to do big things when I grow up, but i need my foundations to be solid. How are we, the American students, your kids, your sons and your daughters, be able to learn in grade 1-12 if we have only ~150-160 days. It is very hard to for teachers to teach all teh ciriculum to students in such a small time. If we were to expand the time to 20 days more, we would accomplish much more and have more time tos tudy (for tests, etc) and still be good.