I would like to see a similar test done of truly blind written exams, like for instance the Spanish university admission exams [selectividad]. guaranteed to evoke a violent reaction from police is to challenge their right to "define the situation." --- David Graeber citing Marc Cooper
This should be double tested with controlled blind and double blind experiments.
Point 1 is not true. Point 2 and three could be possible, but all the literature about other similar issues points that two is highly correct with 3 difficult to detect.
On the other hand 2 is not at all universal. Actually ,as I said, the best way to get a good grade is that the teacher knows you got good grades in the past. A cumulative effect happens and nobody notices..but blind and double blind experiments have shown this to be the case clearly.
This is why in Spain professors do not have any idea about the grades of the student in high school when the exams to acces the University are performed. They also must be university professors. It is have been shown to have to most fair grades you can ever get.
A pleasure I therefore claim to show, not how men think in myths, but how myths operate in men's minds without their being aware of the fact. Levi-Strauss, Claude
