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As far as i remember i hardly need to refer back to L1 much, apart from say the ROE DuPont formula which they assume you would have already know. Also, L1 formulas are briefly mentioned again in L2 materials if it’s required in L2.
For example, you learn about CAPM and GGM in L1, they explain in detail how it works, the drawback, etc but in L2 you are required to use it (L2 assumes you already know what it is).
As for LIFO and FIFO, I hope you are not blindly memorising what LIFO/FIFO are and the adjustment to the reserves etc. As long as you understand the concept, it will stay with you longer even till L3 or beyond. There are many concepts in CFA that don’t need memorising and you could use those ‘spare memory slots’ for other tougher formulas.