I think no. 1 is the only one that is wrong - To express this you would be better to say "I am working as a high school janitor". kin d ergarten from the German "kinder" - children('s) "garten" - garden
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
AnonymousHi,
I think you can use 'school' in your sentence without any article if you use the word to mean the place of l