It's never too late.. (don't get put off by the cliche xD), but no it isnt. Look ive always been a geeky student, but i have seen dumbbottomclass kids excel. It all depends on having something to drive you..you need to commit, you can't just mentally say i want to become smart, you need to open the books, listen and class and etc. to actually achieve this goal. Oh and its not a fast process, it's a gradual thing.