Kestrel keeps children's records, so accounts are not open to sign up for. Whoever administers Kestrel at your school creates yours against your work address.
Already been set up?
Sign in with your work email address. The first time, you will be sent a six-digit code; after that, a passkey signs you in without one.
Not sure who administers Kestrel at your school? Your business manager or IT contact will know.