Depending where you live, check with a local college about extension courses.
I'd been trying for ages to advance my math skills through solo-study, but I always ended up with too many unanswered questions. Very recently I finally bit the bullet and enrolled in some extension courses at UCLA, and I'm loving (almost) every second of it and learning leaps and bounds more than I was on my own, at a minimal cost. If you've got the time and the money, I give it my vote.
Everyone has a different style for learning, but like others have mentioned, study study study.
I'd been trying for ages to advance my math skills through solo-study, but I always ended up with too many unanswered questions. Very recently I finally bit the bullet and enrolled in some extension courses at UCLA, and I'm loving (almost) every second of it and learning leaps and bounds more than I was on my own, at a minimal cost. If you've got the time and the money, I give it my vote.
Everyone has a different style for learning, but like others have mentioned, study study study.