My wife reports the following "oddities" in the C4 test. I've searched the text and think I agree with her:
There is a question on the date of establishment of the NI Parliament. The answer is given as 1922. The correct answer as far as I can tell should be 1999 (not given as an option), and the term should be ASSEMBLY not Parliament.
There is another question about the number of members of the NI Parliament, which is not mentioned in the text.
The test asks how frequently local gov elections take place. The answer is not in the text.