What if the student can’t access the test with the start code?

If the student is on the start code screen, one of these fixes should work. Try them in order:

Make sure they were checked in to the room or marked present in Test Day Toolkit.
Make sure they entered the 6-digit start code for the room they’re checked in to. For AP Exams, SAT School Day, and PSAT assessments, check the 5-letter room code, too.
Navigate to collegeboard.org. If the site doesn’t load or if the device is a Chromebook, go to How do I check for an internet connection?
Restart the device and reopen Bluebook.
Use a backup device with Bluebook installed if one is available.
Reinstall Bluebook.