NoMachine, the free version, is perfect as a remote access tool for almost anyone, so that means if you are in a school that needs to provide a tool for easy access to remote hosts, perhaps you are an IT admin, then you can use the free version. It depends what your requirements are, but also what the school wants to do with the software.
For example, if you need to provide remote collaboration between teacher and students, you should probably contact our sales team to see what your options are. The free version offers one connection which means that multiple users can’t connect to the same PC simultaneously. For that you would need Enterprise Desktop, or perhaps Workstation if they are Linux.