My keyboard, although TKL size would simply not work with the computers i have at school. They're too old.
You may already have thought of this, but just in case: have you considered starting a new thread giving the makes/models of the computers and the make/model of the keyboard you would like to use on them?
I would be very surprised, indeed, if someone on GH could not contrive a way for you to use the keyboard you enjoy with the computers with which you are stuck.
I only wish I had something to offer in the way of practical advice. However, my own formative computing years were spent cranking away* on one of these:
...and keyboards did not enter the picture until much later, alas.
*When I say, "cranking away," I am not speaking in a metaphorical sense.