What do you have in mind for the style and theme of the app?
The current app is black and gold, because they are school colors, any color is fine though. I like simplistic designs, that allow users to do a task with ease. You can download the current app and look at the flow. I would like to keep it simple and iff possible remove some steps.
Their should be three screens.
Screen one should show a list of the class that user has added with a way to add more classes.
Screen two should show a view of the class and all the grades added for that class. There should also be a way to add and remove grades.
Screen three the screen the user adds the details for a class.
The details to be added are the class name, a class picture, the components(test, homework, quizzes) and each components weights.