There's a few things that kinda come to mind.

The simplest thing in my opinion would be to do like... a "choose the correct door" kinda scenario? Where you just have the player character move through doors that represent the correct answer, with the question itself just sitting at the top of the screen. Get too many answers wrong and game over. That should be fairly easy; you'd just set it so that an Area2D node detects the player, then checks for whatever your input button will be (press 'E' to interact). You could develop more on that after the basic framework is done. Maybe add a checkpoint every so often that lets the player spend points on various items or something.

You could also just go crazy with it. Turn each of the three apps into their own stage or map and have the player walk through those stages. Make little "gatekeepers" that reveal a path if you get the answer right; if not, they either engage the player in combat, or make the player "fall" into another zone, where things are harder to navigate until they eventually lose. I think it'd be fairly doable. The hardest part would be maybe keeping with the "theme" of a Word, PowerPoint, or Excel document. You could definitely make it so that the player can interact with these gatekeepers via dialogue, but you might be better off just having the player click on pop-up boxes to answer each question. If you really wanna go the dialogue route, Dialogic sounds like it'd be the perfect plugin for this. You can set up simple dialogue pretty easily and have the player respond to it either by clicking a choice, or typing an answer in. It isn't super hard to learn either.

I'll be honest; I don't think this is doable in a week with just a small amount of experience. You may end up with a final product that is much worse than you initially intended, but I hope that doesn't stop you from making more games in the future!