Unfortunately, the app does not work. Every time I sign in and start choosing the full-length practice, it drives me out of my account. I reinstalled the app several times and called the technical support, but the issue was not resolved. I am going to pass the test in March and I am afraid to have the same situation with signing in on the real exam. I will be happy to change my comment and add more stars when the problem disappears. Here I ask the CollegeBoard team to help. Thank you!