Indeed it will, it's the same with anything, theory and practice should go together, There's nothing wrong with boning up, but, in my experience, as your FI takes you through the course, you will experience situations that you have only read about, that, combined with the theory will make life a lot easier, I'm probably not explaining very well here, but, I'm sure you will find it easier to do your ground exams with the help of your FI to guide you, they're not easy.