Probabilidades e Estatística B

My god, what can I say about probability? It's a very interesting subject. Personally, I love and have always loved probability and statistics in high school, and here it's covered in much more depth. The problem was the difficulty of the tests... I had classes with many repeat students, and most of my friends couldn't pass the subject due to the demanding nature of the tests. The failure rate was extremely high, I've never seen anything like it. In fact, the professor was excellent at teaching! I went to all the classes, and he teaches well, but he made the tests specifically for the students...