"Threatening public officers and employees and school officials" means you threatened a school worker and the worker reasonably believed you were going to physically hurt them.
Disclaimer: Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue. This answer does not create an attorney-client relationship.
California Penal Code §71 makes it a crime to threaten public officials, and public employees (including teachers) to prevent them from performing their duties.
It is a "wobbler," meaning it can be charged as a felony or a misdemeanor. A felony conviction of Penal Code §71 carries a maximum sentence of three years in state prison.