DO NOT SUBMIT BOTH FORMS ("A" and "B").
It takes a bit of time to enter your proctor into the system and then to email them your exam. Depending on how busy it is, this can be one to two (or more for midterm and finals) days to get your exam information to your proctor. Make sure to account for this time by turning your form in ASAP. If you don't allow for enough time, there is no guarantee your exam will be received by your proctor in time for you to take it.