Aldwick is not a school town. The village has no Ofsted-graded school of its own. Couples with children make up about one home in nine here. Single pensioners make up about one home in five. The median age is sixty-two. This is not the postcode you come to for the school run; it is the postcode you come to once the school run is something you remember rather than something you do.
What follows is the list of named schools in the wider area, not the catchment for any specific street in Aldwick. Admission in Arun is set on distance to the school gate, which sounds neutral and is not. Two postcodes a hundred metres apart can end up at different primaries, and one of those primaries will be the one you wanted. If you are house-hunting on schools, the work is not "find a good school near Aldwick". The work is "find the address whose nearest school is the one you want, then check whether that address falls inside Aldwick". Most parents do the work in the wrong order and discover the gap once the offer letter lands.
In the wider catchment, the named primary options include Bartons Primary School in Bognor Regis, Edward Bryant School, Nyewood Church of England Infant School, Nyewood Church of England Junior School, Rose Green Infant School, Rose Green Junior School, Southway Primary School, and St Mary's Catholic Primary School. The named secondary is The Regis School. None of these sit inside the Aldwick boundary itself. The two Rose Green schools are the closest practical options for families living in the smaller Rose Green settlement that the wider parish formally includes, which is why Rose Green tends to do more of the work of housing actual children than Aldwick proper does. The rest of the primaries are spread across Bognor Regis. The Regis School handles the secondary-age population for the area as a whole, which means it is the school families plan around whether they intended to or not.
Aldwick scores three out of five on schools by default, which is what happens to a rating system when there are no graded schools inside the boundary to score. If you are house-hunting with primary-age children, the address you want is in Rose Green or Bognor Regis, and whether that address is technically still Aldwick is the question your conveyancer can settle for you. Aldwick is what you buy once the school run is no longer your problem.