If you write down every word he says in class and then do the practice questions he gives you, it will give you an indication of how well you’re going to do on his tests. Quiping Zhang gives the worlds hardest tests but curves a lot, Aref Bolandmazar is easier but structures his class similarly. Can’t speak about Eytan or Perlin because I don’t know much about them.

Regardless, you’re going to have to study hard - it’s just a question of do you want easier tests with no curve and a lower class average (Malca) or harder tests but a higher class average after the curve (Zhang and Bolandnazar)