I chose Bristol Groundschool over competing courses because of the excellent reviews online and not offering discounts to lure people in. The training at Bristol Groundschool and the quality of ATPdigital is outstanding. I still use the books for revision. The trainers are excellent and they know what they need to do for you to pass.
If you think you’ve studied enough, study another 10%. This will make all the difference. That holds true at the airlines as well.