If you use SCH more then all in MND, if you use SMN more then all in INT. If you want to use both, then us the Keeper Hymn (from GC for 250 seals each) and change the points to the appropriate stat for the class you are about to use.
And whatever you do, do not listen to the advice of people who say INT on SCH as it doesnt matter, if you are a SCH, then you are a healer and MND is your primary stat. If you decide to DPS whilst healing, you use clerics stance which makes the 30 points in INT absolutely obsolete. (Source: end game SCH, T13).