Kiakaha

I did all of the multiple choice CFAI EOC questions (none that weren't mc).

I think out of any mc questions you can do, they are the most important as they are questions put out by CFAI. No test prep providers can be more on point than CFAI themselves.

I think it is especially important if you are primarily using a test prep provider. It helps to ensure that you aren't missing out on anything crucial.