You don't. For most people, the commonly used tricks (e.g., Leibniz's rule) are sufficiently nontrivial that you have to review them in the new context. What

You don't. For most people, the commonly used tricks (e.g., Leibniz's rule) are sufficiently nontrivial that you have to review them in the new context. What you've yet to experience however is just how vastly long life is after college. If you think you're barely able to keep everything in your head now, just wait until you're 30. If you haven't gone into academia, the maths you're studying now will be like a forgotten dream.