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For me personally as a CFA L3 re-taker, I got owned the first time on the constructed response section and basically ran out of time/rushed to finish the test.
Only yourself understands your own personal strengths and weaknesses. I knew the key to passing L3 was nailing the free response questions. I couldn't have done without Bill's L3 mocks and more specifically, the short answer guide as well as the full answer to help you understand the solution in a pragmatic way. Most of all, the mocks showed me how much to write so you don't waste time. I also found Bill's case questions pretty funny as well!
Andy Steffen CFA