yeah I've found her book tends to make my re enforce my knowledge and make me aware of it, which is never a bad thing but I also find that doing the exercises, even though I fully understand it, will reenforce it even more.
we've had guys spend 3-4 years training to work on vehicles and then u give them a spanner at the end and they look at you dumbstruck lol
so I'm a firm believe is practice practice practice, even teh most basic things need practice sometimes