Good study or good studying?

[ROBINDESBOIS]

If we want to wish sb to have a good studying day how can I say it.
Good studying !
Good Study !
Good day of Study !

[Rusty]

If I want to wish sb to have a good day of study, how can I say it?
Good studying! :good::good:
Good Study! :thumbsdown:
Good day of study! :thumbsup:Good studying!