To determine if graduating high school is a public record in your jurisdiction, you may need to consult the relevant laws, regulations, or policies regarding public records. It's worth noting that even if graduating high school is considered a public record, there may be restrictions on who can access the information and under what circumstances.
For instance, in the United States, the Family Educational Rights and Privacy Act (FERPA) protects the privacy of student education records, including information about their academic performance and progress. Under FERPA, access to student records is generally limited to the student, their parents or guardians, school officials, and others with legitimate educational interests.