I agree with Budding on this one. There was no suggestions that the tests would be GCSE/A-Level standard in Maths and Physics. Nothing online or in the material provided by OAA suggested it would be this level. It is just an instant benefit for those who did their GCSE / A-Levels more recently than others. At least if warning was given, people could have prepared and it would have been a level playing field.
However - everyone found it difficult therefore you would have to think the pass mark would reflect the difficulty (hopefully) meaning it'll be a low pass mark...
Otherwise - it is a long wait until mid-April. I'm hoping they get back to us sooner!