Learning courses for productivity and collaboration (Admin certification)

Hi all,

I'm sorry to report I just failed my first attempt at the Admin certification. I scored well across the board except in two areas: Productivity and Collaboration, and Agentforce, which brought me down. I went in feeling confident, so it was a bit of a surprise. 

I'm now looking for additional study material focused on Productivity and Collaboration. A Trailhead search turns up 138 results, which is a lot to sift through on my own. Has anyone taken this exam recently who could point me toward the courses or modules that are most relevant to what's actually tested? Note that I have already taken the Admin beginner and intermediate, as well as the exam prep.

Thanks in advance!