De or het schoolwijsheid?

The correct Dutch article is:

de schoolwijsheid

Rule Words ending in -heid: almost always de. See the rule

How to use schoolwijsheid

the schoolwijsheidde schoolwijsheid
this schoolwijsheiddeze schoolwijsheid
that schoolwijsheiddie schoolwijsheid
our schoolwijsheidonze schoolwijsheid
your schoolwijsheidjouw schoolwijsheid
every schoolwijsheidelke schoolwijsheid
which schoolwijsheid?welke schoolwijsheid?
a big schoolwijsheid / the big schoolwijsheideen grote schoolwijsheid, de grote schoolwijsheid