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I wouldn’t bother reviewing anything from the L1 books….jump straight into L2, everything you need is in those books (there are even optional review sections to recap any base knowledge you need that isn’t directly tested in the L2 exam). The only exception I can think of to this is some of the financial ratios…but they shouldn’t take more than a quick Google to get you back up to speed.
so yeah, I believe a review of L1 wouldn’t be at all your best use of time. Even though the L2 subjects do in some ways lead on from L1 material, there isn’t actually THAT much direct overlap.