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I’d say no, L1 review is definitely not necessary….the L2 curriculum has “optional recap sections” whenever they are needed and in fact in terms of specifics there really isn’t THAT much explicit overlap between L1 and L2. I mean of course general foundations are built on, but any specific knowledge needed from L1 is explicitly recapped in the L2 materials.
Dive right into the JOY that is the L2 experience my friend 😉