In high school, I participated in a STEM-based competition. There were a ton of categories like CO2 dragsters (my favorite), architecture, 2D and 3D CAD, GIS, and numerous others I can't remember. Some categories had more of a business focus but most were science/engineering related. The 3D CAD one was pretty fun. I recall two parts. In the first half, you got a hand-drawn sketch of a bushing and had to recreate it in Autodesk Inventor as fast as possible and then generate a 2D drawing properly dimensioned (like what you'd hand to a machinist). The second half involved creating all of the parts for a basic ceiling fan and then making an animated exploded view that also spun the fan. I was really good at that stuff back then but I definitely wasn't the quickest. I'm sure it's a lot different now, so much of CAD now involved CNC and 3D printing that's there's probably aspects that include messing with gcode now.
My GIS competition was fun too. They gave me a bunch of map data and I had to produce a report on Washington DC storm surge flood zones and potential rescue helicopter locations all within a couple hours.
I recall there being a video production category too. I didn't compete in it but you'd be given props and dialogue to turn into a video over the course of a day or two. Very few of the categories were contemporaneous competitions, most were long term project presentations.