Kengineer,
Aiming for 100% is obviously admirable but when you see the sheer volume of material you'll realise that passing all the exams at the first attempt is achievement enough. Furthermore, whilst there is much of value in the content, there is also a massive volume of detail which is simply not required from the modern commercial pilot. Can't remember the last time I used grid navigation or calculated transport wander!
Incidentally, I was an engineer in the RAF until a few months ago. Hopefully, you should find your service training and attitude useful if you pursue a career in commercial aviation.