Data recovery efforts have been unsuccessful for a school whose computer systems were encrypted in a cyberattack last month.
Following a 21 May attack, Thomas Hardye School in Dorchester reported that all screens and computer systems were locked.
It stated that a complete loss of data, including some students' BTEC and A-level assignments, would be the worst-case scenario.
The incident may have led to a data breach, according to head teacher Nick Rutherford.
The school has refused to pay the ransom demanded as part of the attack, which also rendered email and payment systems unavailable.
According to the Local Democracy Reporting Service, it stated that it was collaborating with exam boards to assist affected A-level and BTEC students.
Mr. Rutherford wrote in a letter to parents and caregivers: "We hold a large volume of data on staff, students, and parents and are aware of the seriousness of any such data breach. We are adhering to instructions from the Information Commissioner's Office, and we'll keep you informed as we go.
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