Bimometrics were tried at some schools/colleges
And the parents were up in arms about it; I'm not even sure of the legality of finger-printing Primary children; Even the Chinese baulk at that!
Daughters old nursery school started using one of the online education tracking systems, despite my pointing out the servers and all the data they held are based in the USA, and so break the DPA.
I am teaching my recently turned 6 y/o daughter to set passwords the way I do; pick a memorable phrase from a book or film she likes, and swap out the "O" and "i" for 1's and 0's.
Example, Scoobydoo fan, "Th0seDarnK1ds"