Bon Bien Mauvaise Mal

I've been thinking about this a lot over the past few weeks and it's doing my head in! It seems simple but it's not! I've had it explained to me too but I still don't quite get it as there seem to be so many exceptions to the rule..


Here are some links which explain it

French.about.com
Word Reference
French spanish online




Test your knowlege

French.about.com - bon vs bien, mauvaise vs mal
Français facile - bon(ne) ou bien
Français facile - bon bien meilleur mieux
Jeu de l'oie - bon bien mal mauvaise


After reading through all of that I think I understand it better now but I am still not correct 100% of the time...