The modal for unit tests does not use screen size very well.
It is very annoying having to scroll up and down to look at the material in the test,
because that forces me to remember question material while at the same time trying to solve the question. There is no value in memorizing the question material.
It would be nice if there is full screen alternative (like for quizzes) or if the modal size increased with the window.
See https://support.khanacademy.org/hc/en-us/requests/378815 for screen shots