Use this: https://ayumilovemaple.wordpress.com/2008/10/01/how-to-do-maplestory-job-advancement-for-warrior-bowman-thief-magician-pirate/
If you still can't figure it out, ask the community on discord.
ALSO:
Instead of fighting the two bosses you can go to the 44th floor in the EOS tower (Ludi) and buy the super secret scroll for 10m from Vega