Passed PL-300 today with an 850 — AMA / sharing my prep in case it helps someone

Just wrapped up the Power BI Data Analyst exam and scored 850. Wanted to share the full story because my path here was a little backwards compared to most posts I see in this sub.

Background: I've been using Power BI at work for about 5 years — building reports daily, working with real stakeholders, real deadlines, the whole thing. So going into this, I wasn't learning the tool. I already knew it cold from day-to-day use.

Why I took it now: Earlier this year I went down the Microsoft Fabric rabbit hole and passed DP-600 (Analytics Engineer Associate) and DP-700 (Fabric Data Engineer Associate). Fabric was a totally new ecosystem for me — lakehouse architecture, data engineering, pipelines — and it was a steep climb. Once I got through both of those, I figured: I've been deep in Fabric theory for months, why not close the loop and actually get certified on the tool I use every single day at work?

How I studied:

• Microsoft Learn's official PL-300 path — mainly for the exam-specific vocabulary and edge cases (RLS, deployment pipelines, dataflow gen2, sensitivity labels) that don't naturally come up in day-to-day report building
• Beyond that, honestly, most of my prep was just... years of production work. Building star schemas, writing DAX measures, fixing filter context bugs, setting up row-level security for clients — I'd already done most of what the exam tests, just never had to name it in exam terms

What the exam actually covers (for anyone prepping):

• Prepare the data (~25-30%) — Power Query, data profiling/cleaning, connecting to sources
• Model the data (~25-30%) — star schema design, relationships, DAX (CALCULATE and filter context show up constantly)
• Visualize and analyze data (~25-30%) — report design, interactivity, analytics features
• Manage and secure Power BI (~15-20%) — workspaces, RLS/OLS, deployment pipelines, refresh settings

Biggest takeaway: If you use Power BI heavily at work, don't sleep on this cert just because you "already know the tool." The exam still tests things a lot of self-taught/on-the-job users never formally touch — RLS design, deployment pipeline mechanics, DAX time intelligence functions you might not use often. I underestimated how much of that would show up.

Happy to answer questions if anyone's prepping for this one, especially if you're coming at it from the Fabric side like I did.