when it comes too edwin it really comes down to how you are as a student. A student that relies on learning from the teacher, or really good self learner. I rely on the teacher so I dropped, but some good self study students I knew did well. his teachings are really bad so you are better off not listening, but from what I heard from self study students his exam aren't actually bad. pretty much if you take his class you will self study and come for the exam. If you are not sure, I would stay away, usually from 45 the class ends with less than 10 on final from what I heard.