GDPR sets out how personal information should be treated. The DfE has shared guidance for reference but the school’s own policy should set out the retention periods to be observed.

The clearest guidance we have yet found is that linked here - schools are invited to condsider this when creating or reviewing their own approch

In any event data held in your MIS should be kept clean and accurate in order to support the school’s use of the data.

Please refer to the pages linked to the left which seek to describe processes in SIMS which can help schools to identify problems with data and how efficiently to correct these.