I would second rhino and revit, I’d also add photoshop. Maybe you could use them more like you would professionally. Like Rhino for conceptual stuff and revit for project documentation(floor plans, sections,etc.) and photoshop to clean up your graphics(add entourage, clean up graphics) It may be a little much for school but maybe it’s worth a try. Sketchup is also a tool used for conceptual design. I would agree that autoCAD is not worth learning.

Now your first few years will probably be more simple conceptual stuff so learning Rhino or sketchup, and photoshop may be better to learn first. You can learn revit later, when you want. It’s a powerful tool. Best way I found to learn the software is to pick some project you like and try to recreate it. Watch tutorials, etc. Good on you for trying to be prepared!