Nothing hurts more than regret. If you are serious about this, go for it. to test yourself, grab a Calculus book - I recommend Stewart's Calculus - and challeng

Nothing hurts more than regret. If you are serious about this, go for it. to test yourself, grab a Calculus book - I recommend Stewart's Calculus - and challenge yourself to work though it at a reasonable, but predetermined pace (say 1 chapter per week).