neil1234

What do you consider a "huge" time investment? Anyway, if you want efficiency, cross CFAI textbooks off immediately. Don't even open the box. Get Schweser or some other supplementary notes. Focus on the summary tables.

Not sure about the classes. Maybe it helps (?). From my experience, L2 material is all about memorizing accounting rules though. I don't think I would have benefited from going through it with an instructor. Everyone is different though.