I just started the World of Math challenge on Khan Academy, which is essentially a series of excesises that improve math proficiency and track your progress. I really enjoy it, as I find the excesises very well-structured and efficient in helping me retain information. I’ve only been at it for a little bit, and am hovering around a third done with the entire challenge! 100% mastery would demonstrate full understanding of all Khan Academy-provided math material (counting to calculus). I know there must be someone interested on here! Check it out, and if you’re interested in pursuing the challenge, reply! It’d be great to start a community, exchange how we’re progressing, and possibly explain to one another how to get past certain problems that may seem impossible at first. Anyone up for it?