We cannot guarantee students using the ATC for extended time/low distraction will be able to schedule their exam at the exact same time you give the exam to the rest of your class. When you submit your exam request, you are asked to give a date range when the student can schedule, so you do have control over the general test taking timeframe.
For time-specific requests, note your time preference in the Additional Information box of the request form and then get in touch with our office.