Have you been able to see the tests? Sometimes people/children do not read the question well. This was happening to a very close friend of mine’s daughter in math. She called me because I am the math one out of all of us friends from college. Seems many of the children in the class were doing badly in math. Anyway, as we went over the test I realized every time a question was worded in the negative, like which one of these numbers is NOT even, she got it wrong. Or, if a question said the opposite of what is customary, for example: put these numbers in order from highest to lowest. If all the practice problems were lowest to highest, she would get it wrong on the test. Even then my girlfriend was still seeing it as a math problem, and I told her, no it is a test taking problem. Unfortunately this teacher was very keen on throwing these types of questions at the children. Just a thought.