If you want a faster method, since I've learned the hard way, teens don't learn as easily as they do when younger. There's a cheat for it.
testingcheats true, enter, stats.set_stat lifeSkillStatistic_Manners 100, for instance. You can vary that number if you're only looking to give them a slight boost. Sometimes I'll give them 45. It works on all of the values. Just follow that as typed (changing out Manners for the value) and voila. On the values that have two words use _ConflictResolution and for the other one, _EmotionalControl.
Hope that helps. Enjoy this Pack! I think it's great. Finally, we get a real say in how our born in-game Simmies turn out. :)