Toffair
There were, and probably still are, people selling grades. I have seen students that didn't deserve a 2 go away for a little while and come back with a 4
This was happening with individuals and training centres authorised to carry out the tests, not within ANAC itself. How they obtained that authorisation is another question, to which you and I probably know the answer. ANAC does take action against these practices, and more quickly than you might think, but it's a nice little earner so there is always someone else ready to take over.
It's been 18 months since I was involved in teaching for the ICAO test so things might have changed, but, the last I knew, you could only take the test in São Paulo at the TAM academy or ANAC, a measure taken in response to the grades being sold elsewhere. All tests are recorded and stored for review by ICAO should they ever feel the need to review anything, so irregularities will come to light eventually.
Weird, I just defended ANAC
TTFN