Rules and regulations governing life safety in school buildings (R277-400-6 & 7) require that emergency drills be conducted during each school year.

ELEMENTARY SCHOOLS:
All schools shall have 1 fire drill in the first 10 days of the regular school year.
All schools shall conduct at least 1 other emergency drill no later that October 1 annually.
Elementary schools shall conduct a fire drill every other month. (5 per school year)    
Elementary schools shall alternate other emergency drills with required fire drills. (4 other drills per school year)
     

SECONDARY SCHOOLS:
All schools shall have 1 fire drill in the first 10 days of the regular school year.
All schools shall conduct at least 1 other emergency drill no later that October 1 annually.
Secondary schools shall have 1 fire drill in the first 10 days of the calendar year.
Secondary schools shall have at least 1 fire drill every 2 months.  (4 per school year)
Secondary schools shall alternate other emergency drills with the required fire drills.  (2 other drills per school year)

NOTE:  You are also required to document this drill on your year-end compliance statement.