monk quest should skip the first part of bringing items if you are job 50. it does not.
Assassin quest has 3 parts, 2 sets of questions if not job 50 otherwise just one, the 'kill target monster only' part, and the maze. my level 42 assassin only got 1 set of questions and then was tasked with the maze to end the quest quickly, there was no quest for killing target monsters.
both these quests are bugged.