It also came to my attention, ..... that he had the power to pass or fail you, depending on whether he liked you are not.
If anyone conducts a CAA Examination unfairly, the candidate has the right of appeal under CAA Regulation 6. If you had failed an exam, the examiner is required to give the candidate a Form 252 detailing the reason for failure and is required to explain the Appeal procedure on the reverse of the form. I take it that you did not fail any of the exams.