JufusMum its probably not worth discussing it now as its so late, but, I think your DD is mistaken.
It is multiple choice, and its true that the exam isn't, but it tests knowledge and tells you the right answer and it does it over and over until you know the right answer without having to think.
Even the longer questions which ask you to describe a six step process (for example), tassomai asks you randomly what step 4 is, so you learn those too. DS says it made a difference to him on the recent paper 1s. I suspect it just found and resolved the things that he didn't know that he didn't know (iyswim?).
You don't need to know your DD's login, as you can log in to your account (which you need to do to manage it) and it has a link to let you see your child's dashboard. Obviously, that's not worth knowing if she isn't using it though.