Yeah.. it's total bullshit..
But realllllly helpful if you are on the favoured side!
Do you walk past teachers and greet them or have a joke or something with them? It improves the teacher - student relationship.
Try seeing them after class too and going through tough points - if they know you are working hard or struggling with something then they might be lenient on mistakes made in SACs and things.
If you disagree - I'm just saying it works for me!
The weird thing is that I do have a good student-teacher relationship, I think he has some idea floating around his head that some students are more "capable" than others, leading him to sugarcoat some student's weak points. But of course it's good if you're on the favoured side, but I'm not
