<p>I only came into university with eleventh grade physics (originally intended to major in math). I took a intro to physics I and did very well and took intro to physics II. By then, I had enough credits to declare a double major in math and physics. In fact, I did much better in the class than those who came in with grade 12 physics. </p>
<p>However, I suggest you try doing the Open course-ware to see if you actually enjoy physics. It isn’t as glamorous as the media and celebrity scientists portray it to be, and much of first year physics (especially kinematics/dynamics) can become mundane really fast despite building a solid foundation for those upper year classes.</p>