Discipline to read!
You must have discipline to ensure that you keep reading the books and take it in!
Yes they're certainly not the most exciting books to read by any means and at times hard to find the motivation, but your discipline to keep reading and keep taking the information in, and to keep to your reading schedule is of utmost importance!
Remember you have 3 chances to pass each subject with your flying school before heading to gatwick for a fourth (which if you read the books and use your confuser properly, you won't need a fourth, or third actually)
Also, from your first ground exam pass, you have 18 months to pass the other 6 ground exams. and get the practical R/T done in this time as well. I aimed for 3 weeks per subject minimum, a chapter plus questions a night (but thats me).
Need discipline to switch off the football and pick up the book!
Once you pass ALL your ground exams, you have 24 months to pass the skills test, but I can't imagine that anyone would need that long!
This according to LASORS.
reward at the end!