First of all, kudos on the turnaround. I think the most important thing to keep in mind is except for a few scattered geniuses, no one is inherently good at mat

First of all, kudos on the turnaround. I think the most important thing to keep in mind is except for a few scattered geniuses, no one is inherently good at math. I know it sounds like a tired metaphor, but math really is a different language (which takes a lot of study and practice to achieve fluency). If you lack fundamentals, skip the sources and look for the people. Find a good teacher and take their class. This will probably entail an intense week of course shopping at a local school. Friendly fellow students can be a huge boon, at least for me, since I solidify concepts best in conversations with peers. If you, for some reason, absolutely cannot take a class in person, I would encourage you to find a study partner and watch online lectures together. I really like MIT's Linear Algebra and Differential Equations videos (http://ocw.mit.edu/OcwWeb/web/courses/av/index.htm#Mathematics http://ocw.mit.edu/OcwWeb/web/courses/av/index.htm#Mathemati...), but but I don't know if those are at your level.