Resembles one of my universities where they were lowering valuation of problems after exams depending on success rate (e.g. a problem worth 4 points was reduced to 0.8 if too many people had it correctly, and a problem worth of 0.6 points rose to 5 points if almost nobody had it).
Reminds me of a college exam I had on unix administration - 6 questions, 8 hours time limit, open book, open internet, open everything, you could even call your dad to ask for help or collaborate with classmates - yet only 2 people out of 30 passed. The highest score was 53%. Yet the teacher was able to demonstrate correct solutions for all the problems.
