Sheffield
In answer to you question, for the Sheffield Course, they will advise you learn the Q&A's simply to get the ADX finished
Sheffield will then teach you their way and believe me their standard is very high. Sheffield just see the ADX as a hurdle by the FAA
After the course, you will have a sound knowledge of areas covered, which is why Delta etc take on Sheffield graduates
Send me a PM if you require further info or call Sheffield and speak to Eric Morris / Katja
Cheers
KP