How important is knowledge of Level I and Level II topics for Level III prep?

In my opinion, the one thing that’s extremely important from Lvl 1 that flows into Lvl 3 is time value of money. You better know how to solve all those PV, FV, annuity, etc questions. On lvl 3, there’s always a huge essay question that’s worth at least 30% that has to do with some sort of retirement planning. I find it extremely easy to mess up on timelines simply by not knowing whether something happens at the beginning of the year or the end of the year, because the language can be vague. So make sure you know how to solve complex TVM questions.

L3 is definitely built on a foundation of L1 and L2 knowledge. You won’t need to know the material inside out but you’ll need to have a good foundation and not have forgotten everything.

Kaplan Schweser used to include a ‘recap book’ with their materials, not sure if they still do. But if you need an L1 and L2 refresher the Secret Sauce books might be a good option.