time management, time management, time management...you will have plenty of time to do everything if you use your time well. If you don't...it is going to be a problem.
My son is a what would be considered a competitive D3, they are serious, they recruit kids who they feel have fallen though the cracks a typical fall ball week besides classes is
5x a week lifting / conditioning - this started around week 2 or so of school and is the whole school year. Finals week I believe they have off for conditioning.
2x mid week individual / small group workouts - 1or 1.5 hrs
2x mid week practice 2.5 to 3 hours
Friday / Sat / Sun - team practice and scrimmages will be on 2 of the 3 days depending on week - will be full 4 hours both days.