The flight grading will take into account unfamiliarity with aircraft and airspace, if you don't make the grade it is because you didn't make the grade. I am afraid those of you that get into CX have to get used to this, every two months as an SO you do a 4 hour sim session with 8 sections marked from 1 to 5 just like flight grading. You also have a line check every year with 17 sections marked from 1 to 5. Get lots of 3's or lower and go for a chat, keep doing it and you have extra training, keep doing it and you get fired. On upgrade to JFO from SO I think it is 40 line training sectors all marked from 1 to 5. Mess it up get another go then get fired. People who have been here for a while mess something up or upset the wrong guy and have extra line checks and sometimes get fired. Dont email saying you were unfairly treated, try again if you have the opportunity but emailing saying its not fair will just confirm their decision to fail you.