So in September of 2016 I will start college for science & engineering, which will be mostly studying physics, engineering and a little chemistry. I've been studying on Khan Academy for the past few weeks, with the help of some friends online I've been passing all the practices pretty easily. Right now I'm trying to complete all of the Math from Algebra 1 and after. Then after that I'll be studying all of the Physics, and if somehow I have the time and will to do it I will study chemistry. Does anyone here have experience from Khan Academy or know if it will give me the amount of knowledge I need to get a good start in college? I live in UK and am 18.