Ask yourself this, are they going to put your grades on your pilot certificate or license? Before the freedom of information act, its one of those little unintended consaquences, you had to really study and study hard for the FAA written. A good grade was 80 you needed 70 to pass. Now most get mid 90's to 100 %. In the old days the saying was 70 was equal to 100. I understand that its a little different in Europe. You guys get to take 14 exams and spend a half a year in ground school, and its not cheap. Get the best grade you can, in the end it will not matter much, except for some HR non flying types. In all my years, what I got for grades on the faa exams never came up. On the other hand, the pre employment exams counted a lot. But not enough if you interview badly. When its all said and done, the only thing that counts is that ATP in you wallet, and 4000 hours in the Logbook, better if most of that 4000 hours is heavy jet, if that floats your boat.