I am a re-taker for the CFA L3 exam, and I highly recommend Bill's L3 mock exams. The exams are pretty tough overall, and therefore might initially dent your confidence a bit. However, once you're done with all of them (total of 5 - morning and afternoon sessions) it is probably the one most comprehensive to make you feel exam day ready. The other aspect worth mentioning about these mocks is Bill's sample answers to the essay questions which tell you exactly how much you need to write in order to get full marks - a big help in managing time.