A2000 is a great choice for that card. It likes roomy Amigas, because you nearly always end up fitting extra PC cards too (dirt cheap, the Bridgeboard is the expensive part). Get the permission off the retiring head teacher in writing, should make that A2000 yours in a very legally enforceable way, when you print out the authorization and show it to whoever has the cupboard key.
Looks in excellent condition, and still has the socket for the 286 FPU - again, dirt cheap, fairly available.
The long ribbon cable is a floppy connector for a PC floppy, I remember that much.
May it bring you much luck.

As the 286 is soldered in, it will be very difficult to overclock or replace, and if it is an early version of the chip (very unlikely) it might not like DR-DOS. Only snags I can see with it.
https://en.wikipedia.org/wiki/Intel_80286CBM did not ship that many of these cards. They produced a 386 version, and I think Vortex did a 486 based version, very briefly.