Yes, I sort of second what Qhead says... beyond P5, scholy's are year to year, are reviewed and often pulled or reduced if player doesn't perform to the expected standard on or off the field. The only point where I differ with Qhead is that I have seen or heard of PLENTY of scholy's pulled or reduced at the levels below P5, sometimes only because the program recruited better players.
And BTW, most baseball scholarships are partial.