Neillewi,
I don't think the lights in your link are suitable.
Power may or may not be adequate, the modelling lights are totally inadequate and they don't even mention the recycling time, which needs to be fast for this kind of photography.
I sort of agree with Dazzajl, except that image quality (and lighting quality) standards are pretty low with school photography so you can usually get away with upping the ISO if power is inadequate - not a professional solution but then this doesn't seem to be a professional shoot.