hi there
the wood floors in the school, do they just want another coat of polish on the existing polish??
or depending on the state of the floor, the more drastic method is to sand and then seal, but more realistically would be strip of any sealant/polish and then the application of a polish over the top.
depending in the size of area, will dictate what kit you will need to achieve this in an effective time frame.
people do charge by metre, and also by time, depending on the circumstances.
as a matter of interest it may be better to sub out and take a commission, depending on overall sizing we may be interested in taking a look for you
regards
martin