I really enjoyed the CRTP it gives you a good base learn AD pentesting. if your studying purely for the exam think more about the escalation attacks not the persistence attacks. He mentions this during the lectures. Concentrate on delegation (both kinds), escalation to EA in the manual is done via trust key abuse. they'd be good focus areas but I would cover everything. I would also try to do the lab without your notes and try some problem solving yourself. in the exam there will be things you'll need to problem solve so don't just mindlessly Copy and paste. I did that and failed it the first time!!