You say school. However the writing looks to be that of an adult. Which makes me think that this might be preschool or nursery rather than actual school.
I have great trouble with the comment upthread of 'even if done by a ta or volunteer'. The implication being that TAs are thick.
Yes teachers do have to pass an English test. However it is a computerised test and you need to get a percentage correct. This means that it is perfectly possible to have someone who can get something like this wrong but still get through as no one is going to stop them. I have known a teacher who used to write 'should of'.