Remove all mold/ mildew from ceiling and walls
Prime and paint ceiling and walls in bathroom
Wire exhaust fan to operate whenever the light fixture is turned on
Install extra insulation in attic over bathroom ceiling. This will help help the temperature difference to potentially help stop the mildew growth
Caulk the tub where the tub and tile meet. Cracking grout
Repair drywall damage between tub and toilet. Water damage
