I suspect students in England will make a very large number of subject access requests under the GDPR to schools from tomorrow for their teacher-estimated grade as well as rank-order in the class — information which will likely have determined their university entrance. 1/

There is a relevant exemption/delay provision in the Data Protection Act 2018 sch 2 para 25 for exam scripts, but this only pushes the deadline to a minimum of 22 September 2020. The ICO has confirmed this. https://ico.org.uk/global/data-protection-and-coronavirus-information-hub/exam-script-exemption/

The only time I can see a plausible ground for this grade to be refused is where the rank order reveals data about others, such as in classes of 2 or 3 (wow). Even then, no presumption against disclosure (see DB v General Medical Council [2018] EWCA Civ 1497).

Any email/oral request for this info directed at the school will need to be treated by the school as a subject access request even if it is described as an FOI request, or just a request, as the ICO notes. Schools that do not recognise these will not be compliant with the GDPR.