I think the school or even MOE had already done their part to cover their back-side in this case lor... (typical of them in the first place...)
The timing were all printed in 24-hour format... So if the student find the timing weird... he SHOULD have clarified or checked with his teachers or even friends. If he didn't even done that, it just shows what kind of attitude he has...
Furthermore, I believe his friends taking the same paper would have talked about the timing and stuffs after the previous paper... Thats what my friends and I did to remind each other.. So maybe he is a loner or the only student in the school taking that paper...
So the only conclusion would be... the son screws up... kaisu mother tried to helped the son by saying printing fault on time-table... Which who knows, the mother might have done something to it lor....
To put the son in such lime-light, with photo splash on wan bao... The mother can be conferred 2010 Singapore Dumbest Mum.