The registration fee covers the experience over the entire year, including the Class Activities on The Big Challenge PLAY app and the CLASS Challenge, so it's not exclusively linked to the contest.
For the contest itself, we place pre-orders for the purchase of prizes well in advance and confirm on the closing date for registrations. It is therefore absolutely impossible for us to make any refunds.
The contest is open for several weeks, so hopefully everyone has the time to pass before the end of the contest period even if they're absent for a few adys.
In any case, the school will still receive prizes for all the students registered, regardless of the number of students that actually took the test. So even those who really couldn't take part can still get a prize.