3 tests was already better than the traditional Spanish university class: 1 exam. which is probably written by the department head, not your teacher, and he isn't in any way interested in a high pass rate. Failing 90% of the class might even be positive for them. At that point classes aren't even important: You purchase the tests from the last 10 years, and then you have a prayer of knowing what the bar might be this year.

Teaching, fairness and measuring student performance might seem like similar goals, but it's just so very easy to make sure you succeed at one while messing up the others.