As another of those who recently took and passed after just 6 (part-time, 4 hour) weeks of review, what also helps is downloading the Table of Contents for each Instructor-Led course and searching the topics in the ESRI Catalog to find additional resources aside from what's in the learning plan.
Treat the learning plans as introduction, and ensure that you pay attention and actually do the exercises if you can to help remember things.
Caveat: I have also been using ArcGIS Pro and earlier ArcGIS Software for the past 5 years or so.