Huh?

Today I had to proctor a test called the Eiken. It's sort of like the SAT, except it measures a student's English proficiency.

At the beginning the [junior high] students have to fill out their personal information on the bubble sheets. But the two students taking the test didn't know their info! Neither knew their address nor Zamami's postal code and one didn't know his phone number!

I can't speak for kids elsewhere in Japan, but I bet this is something particular to our location. The kids all live close enough to each other that they rarely use phones - and they don't receive any mail. So this information is just not relevant enough to remember.