Source: https://travel.state.gov/content/dam/visas/Statistics/Non-Immigrant-Statistics/MonthlyNIVIssuances/SEPTEMBER%202022%20-%20NIV%20Issuances%20by%20Nationality%20and%20Visa%20Class.pdf

F1 visa allows a student to attend school (Highschool/College/etc) full time. This is apparently the first time a North Korean got an F1 visa since 2015