Spent the better part of yesterday on Khan Academy working on grasping Physics and am feeling much better about starting my coursework in the fall. As near as I can tell, the Calculus I took has more than adequately prepared me for this coursework. Starting to get excited, as I can actually grasp these concepts and do not feel “lost” at all! It is an epiphany that at my age, my brain is still fully capable of stretching, reaching, and expanding my knowledge…LOVE IT !!! 
Congrats! It’s a great feeling, isn’t it?!
Khan strikes again! 
It’s an amazing feeling when something ‘clicks’ and you feel competent in the subject. When it happened to me in calculus it was like a miracle, because I’d struggled so long to understand math concepts. 
Good for you! Another site I used, although not as in-depth or wide ranging as Khan Academy was http://www.bozemanscience.com/science-videos/.