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To me it is pretty straight forward, if you are a repeater and didn't pass the first time using Schewser only, switch it up and add CFAI readings.

If you have plenty of time and don't want to spend the money on Sch use CFAI exclusively.

If you are a first timer for Level 3, give Schweser a spin and see if you can hack this using Schweser only. I have heard lots of stories about people passing using Sch only but everyone's studying style is different.