I rediscovered my old math grind bible -- Engineering Mathematics by K. Stroud.
It's not a math course as such, more like a collection of sure-fire 'how do I calculate ...' recipes and a decent amount of exercises for every topic with answers.
So, I'm working through this book instead of playing Sudoku every time need a short puzzle break --- of course it's still procrastination, but, it feels a lot more productive!
