Primary School = Tues 1/2 Day, Wed Hols
Secondary School = Tues 1/2 Day, Wed Hols, Thurs Hols
Post Secondary (JC / Poly / ITE) = Wed Hols ONLY
Reason of Sec Sch having Thursday off is that many students in
Secondary School participates in the National Day Parade and hence
given 1 additional off days. It will be too messy to issue
individual additional holidays, so it was given across the
board.
Do note that certain Primary Schools / Post Secondary schools will
give Thursday as a Holiday in substiture for Polling day if
'compensation' for it have not been given.
As for why Friday cannot be off, MOE have a guideline on how school
can distribute the holidays.