The ICO has published updated guidance on Freedom of Information (FOI) and Environmental Information Regulations (EIR) which replaces existing exemption guidance where data protection and the transparency of freedom of information overlap and interact.
The guidance can be found at:-
https://ico.org.uk/for-organisations/guide-to-freedom-of-information/refusing-a-request/
All public authorities, including schools and academies, should familiarise themselves with this new material.