Do i think they are all testing to a uniform standard? Absolutely not. They allow some people significant mistakes
I agree with you 100% on that statement. On my cpl test the question's where 1.) anything in the notam's that wil affect us 2.) What is the Vx for the plane we are flying today. 3) He had a look at the performance graph's and wanted to know if we can make all the take off's and landing's.
With the Ir test I could not answer a very silly little question and was told to go and get the answer, so luckily for me a instructor was nearby and help me.