According to NFPA 101-14.2.9 classrooms w/o windows require EM lighting.
Florida Building Code (which supercedes NFPA 101) 423.17.1 says EM lighting shall be provided in student occupied areas. (classrooms)
Generally (here at least) local code officials do not review plans or inspect buildings of a public school, they are built to stringent specifications and inspected by school board inspectors. In my experience they all have EM lighting everywhere.
I can't find specific verbage about classrooms w/o windows in NFPA101 14.2.9 but it does refer me to NFPA101 7.9, and this too does not specifically mention classrooms w/o windows.
I agree with Raider 1, check with local building dept.
In one of the industrial facilities I do work for, they have class rooms some with and some without emergency lighting. As far as I can tell they are not required. These class rooms also have no windows.
Thats kinda tricky having a "classroom" in an industrial. Theres specific rules that deal with assembly and egress one would need to followed, over riding the class of structure or various types of structure in one edifice, and others have posted on it. . Office space adjoining Industrial space comes to mind. But it all comes down to, also said, the AHJ, how they apply the NEC and their building codes.
A good set of drawing will not cause any questions to be asked in the
field. Toast someone when get a set!