I am currently doing my ppl theory exams and using air quiz plus the ppl confuser to help me. I find the ppl confuser much easier with passing first time attempt at them, where the airquiz is SO much harder! It really challenges you but i believe does help eventhough when you get 57% on some exams dis-heartening. The format of the exams i have found so far are much more like the ppl confuser, but i would still recommend reading the necessary material instead of just learning the answers. I have paid £20 to airquiz for unlimited usage for 2years, which also includes exams for the imc. Ive got an exam booked for this sunday, Aircraft gen and principles of flight which i have found much harder than i thought. Hope this helps