Which desktop environment does the Zorin OS 15.3 use is it Xfce or KDE I am not able to tell and also can I change different desktop environment and not by buying the Zorin OS Ultimate?
Core uses Gnome, Lite uses XFCE. Ultimate also has Gnome.
You can switch using: Core to Lite and installing XFCE
What about the Education version I am running that version on my PC?
Also Gnome and XFCE (Lite) options.