I had enough of these comments below: this man can't teach. Can't and can't. He doesn't give a damn about student's learning. He ruins my knowledge of Probability, and he curves down. If you want an easy A? Fine, go ahead, memorize and spit it out on the exams, I'd suggest students who care about learning move on to the next option.

Firstly, my evaluation of Professor Effros pertains only to 170A – Probability Theory Class. I received an A in this class and quite frankly, this was the easiest A I have ever gotten at UCLA. My attendance in this class was sporadic (because of conflict with another course), nevertheless, the lectures that I did attend were worth it. Every little bit of material on midterms and exams had been covered in the class during lectures. There was only one midterm exam and it took me (& most of the class) about 45 minutes to finish it and the final exam was about 100 minutes long for me. If passing the class (and not necessarily learning) is your major concerns, here is the formula:
I) Most of the time Professor Effros will assign homework from the book, however, occasionally he will make up a problem or two on homework assignments, make sure you can do these, THEY WILL BE ON EXAM!
II) Make sure you can do his review sheets for the midterms and finals, 80% OF THE PROBLEMS FROM REVIEW SHEETS WILL MAKE UP 90% OF THE EXAMS.
III) If you follow the first two steps you can get an easy B+ in the class. In addition, if you know how to do homework assignments you are guaranteed an A in class.
If you are a self learner and do not like going to lectures, following the aforementioned steps should assure an easy A for you in the class.
Best of luck!