Before playing the game I read a little about the strategy and it said to not read the stat-boosting books right away because they are the only way to increase your stats after a certain point.
My character now is at level 19 and I have maxed out all of the trainable skills, which I mean to say I tried to train everything I could first before applying any points to them. I'm at the very end of the main game and I have a pretty powerful combat mage. My attack magic sucks, but otherwise it's a very balanced and Powerful character. I've done some grinding so I've got very strong enchant and Alchemy abilities, in addition to 60 points in protection Magic, so I'm mowing down opponents pretty easily.
So I ask again, when should I start reading those stat-boosting books that I've got stockpiled?