You can store values in Thunkable in variables or databases. So when a button is pressed or an assignment is completed, you can change a corresponding value. Then, when the red button is pressed, you can check the value of those variables/database cells and decide whether or not to navigate to a new screen.
By the way, not everyone here is a boy so you may want to use non-gendered greetings like “Hi everyone!”
I’m a teacher so I’m curious… what age students do you teach? Is it during the school day or after school or a camp?
How familiar are you with programming? Have you looked through the documentation and built-in tutorials to learn how to use Thunkable?