you can the mvp id in to a variable list using setarray...
then when the users killed the monster..
use OnNPCKillevent to trigger the event..
during the event..
use a loop to check whether the killed monster ID is match with the id listed in the array
if yes then do what ever you want there...else...nothing happen..
and for the monster level check..
getmonsterinfo( killedrid,1 )