The back of the cartridge says "ROM & RAM Cartridge". Its PCB has two MBM27C512-25 EPROMs, an MB8464A-15L SRAM, unknown chip called 510003RWM and an unlatched push button that is inaccessible from the outside.
No. 4 cartridge displays the text "This is to be kept. There is no need to submit it" but No.1 does not, suggesting No. 1-3 had to be submitted. Since this software was for the distance education, it might had been possible the student returned it for the learning evaluation then the teacher rewrote the contents of the next curriculum and resent it.