Well my tips are.. Since you are a theurgist like me when I passed that. (Except wrong level.)
Some cards I would think that would help are-
1.) 2 of each spells you have. Counting your secondary school or other schools you have. I would suggest lots of healing and attack cards.
2.) You will fight Devora a Death boss, Andor a Storm boss and I think Zora is a Life boss. You will fight two other bosses inside towers. I cannot remember much since it was long ago. Then in the end you will have to fight the person inside Dean's Den. In all there must be 7 bosses to fight. Devora, Andor and Zora, let me warn you, they are not as easy as you think. All 4,500 health (maybe more) and they have minions. 1v2, 2v3, 3v4 and 4v4. If you are fighting the boss alone, it will be 1v2, With a friend, 2v3 and with another friend, 3v4 and with a 4th friend then it would be 4v4.
3.) I would help you if you would give me the time to meet up. (On game.)
I would say, get some friends that are on the quest or done with the quest. At least 1 Grandmaster. (Any School. But be careful who you chose because of the bosses resists.)
Change your deck each time against a Boss.
Hope I helped! :-D
~Abigail Fairyblossom Master Theurigist level 48. (Done with W101.) Abigail Fairyblossom Magus Sorcerer level 33. (In Mooshu.)