@Conformist1688 really? I assumed they were everywhere. My daughter has has a tutorial associated with every module so far at St. Andrews. Tutorial grades have been 10 percent of the grade, with half of that being graded problem sets and the other half being her participation in the tutorial.
I have been pleasantly surprised that all her chemistry tutorials were conducted by full PhDs. In math, it has been a mix.of.grad students and PhDs.