Test words made up

There is in England a reading test that is made up. I mean the words are made up. Actually, it uses words such as koob and zort on students that are very young. Normally these type of stories do not interest me, but this this one is way out there and then some. Hmmm, what "zort" of words are these, maybe we can ask as they seems like nonsense to me. Yeah, I did say nonsense.