There are training courses to attend during non-election periods. And guess what, training sessions are often scheduled during school holidays.

No OIL given, no compensation for loss of protected time. No training allowance also

And this is just some of the compulsory secondments that teachers are forced to do.

For exam duty, seab could have hired their own examiners, invigilators, markers. Plenty of ex-teachers and retirees who are capable of performing the task.
And they do offer such positions on careers@gov. Don't know why still need to draft teachers for meaningless duties, especially for roles such as oral exam timekeeper.
The poor AOE don't even have a stopwatch, and job of timekeeping is fully done by the computer system. The AOE also don't know what is going on at the candidate's end. Don't even know why the AOE is still needed this day and age.

Worst of all, seab duties were classified as self-employment and we were all dumped into the cpf board Contribute-as-you-earn scheme for real self-employed people. And we had to declare exam duty allowances ourselves (which come in piecemeal payments) during tax filing. Nevermind that seab is an organisation under purview of MOE. Nevermind that under employment laws, self-employed workers/contractors have to agree to work, and there should be a signed employment contract between employer and freelancers. So many violations of the law!

During covid, because of poor and unsustainable policies exempting students from carrying trace together tokens, instead of contact tracing carried out by fulltime contact tracers at tracing centres, poor teachers had to spend hours doing contact tracing. More time wasted.

The list is endless. The point is that there are too many non-teaching work eating into officers' time for actual teaching work.