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I personally just re-read Schwesers L1 Secret Sauce prior to starting L2 studies. Having said that, CFO CFI and CFF calcs are important for L2. Especially, CFO using indirect method. Other than that I would just dive in. The basic concept of L2 is very similar to L1 in that the value of anything is its discounted cash flows. So as long as you are solid in your concept of time value of money then just move on.