Despegue, MJ,
Whilst I totally agree with the sentiment of "learn the subject, not the questions" May I be so bold as to suggest caution here....there are a hell of a lot of people that did both.
IMHO (and with apologies to the OP) anyone who DOESN'T use the QB IN ADDITION to studying the material is a fool. Use any resource at your disposal.
Would you suggest that an inexperienced FO caught in a situation they are unsure of should not refer to the captain because they should have learnt how to deal with said situation in sim or theory? Of course not.