For level 1 and level 2, i bought the online trial test which cost 50buck. To my surprise, some of the exam qns are quite similar to the real exam. Also, for the first 6 qn, when everyone is expecting ethics, it came out to be some funny topic( cfa l2 2010) which i forgotten. I was quite shock that for the trial exam first 6 qn, the topic tested is similar.