im 16,love physics, who is about to graduate school, before that i decided that school was too slow for me, so i decided to skip right to the good stuff.... did precalculus and 'How to Prove it' to start me on calculus. i just finished Apostol's calculus vol 1 to prepare me for handling the mathematics to come in physics. i wanted to tackle Goldstein's classical mechanics but i heard its tough to handle without any background. i read that Taylor or Kleppner might be good to get me started as well as the Feynman lectures, whats your opinion? my physics is at the level of freshman, but i can handle tough stuff.. and at what point do i need start learning multivariable, like say apostol vol 2?