Lesson Plans...

Ok, so I've written lesson plans before (obviously), but how exactly does one go about writing lesson plans for different grades/subjects? My schedule has me 30 mins here and an hour there...all over the school all day long teaching different subjects to different grade levels! My job is to help the students with what they're struggling with. I don't necessarily know what that is until I get into that specific classroom with that specific student... Anyway... here I go, leaping over my first hurdle! Lesson plans are supposed to be turned in to be checked by the principal/vice-principal on Monday mornings, so we'll see if they understand the convoluted way I have my plans written...If not, I will find a different way to do them next week! :)