Very simple grades tracker and calculator app in unity for school research project

Hello, I am in need of an absolute expert in Unity to work fast and create by collaboration in Unity a Grades/Scores tracker and calculator based on my school formula. I've been working on it non-stop as it's for my school research project (So I won't be using this anywhere or earning from it) but I'm still just a beginner and have been stuck with error after error. I tried researching for answers and fixes but only get more confused by experts' answers. I still have a lot to learn, but I need this by tomorrow, so I hope someone can help. Not sure if the payment is enough but at the very least I need the main thing done, which is how it will automatically save and show the result of the calculations. Also will be adding a pic of my current work and the error that made me spend, it seems to be a simple error to others but I just can't with my time frame.

Full app details will be given through chat