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Elan here. I actually have never used Schweser before L3 so can’t comment about Schweser, but Elan is perfectly adequate. Study notes and practice exams are reputed to be really good, and I found them perfect for my studies. I did end up getting extra practice papers though. Shame that they don’t have L3.
Your L1/L2 situation is a difficult call. I think it’s probably best to dive right into L2. Saves time, and if you do have trouble and need to go back to L1 you’ll have a focus on what to look for & revise specifically (which again saves time).