{'Cameron': 30}
'Cameron' should equal 'all'

{'Geoff': 30} this is ok in tests.

Maybe I misunderstood something, but why sometimes case with one student should equal name of this student and sometimes it should return "all"?

if name is not given

You could be passed hello() with no arguments. you have to deal with that.

Keep practicing, your rank doesn't mean you can solve katas of the same rank easily.

See how many of those words are repeated in a row :

Iter
Sum
Any
Input
Sum

Those are 5.

Could You explain me why:
'ITEr iTER ItEr SuM SUm sUM fIlTER Any anY iNput INput RouND SUM SUM suM open'
4 should equal 5

Thanks