SASMO vs NMOS: which one, and can you do both?
Start with SASMO. It runs at every primary level, a parent can enter a child directly, and it publishes its award percentages. NMOS is Primary 5 only, school-registered, one attempt ever, and publishes no award cut-offs. Doing both in the same year is possible but rarely wise for a child new to contests.
Side by side
| SASMO | NMOS | |
|---|---|---|
| Levels | P1–P6 | Primary 5 only |
| Entry route | School or private candidate | School only |
| Format | 25 questions, 90 minutes | 35 questions, 90 minutes |
| Second chance | Every year of primary | None — P5 only, once |
| Award cut-offs | Published: Gold top 8% | Not published |
| Cost to enter | ~S$30 school / S$57 private | Set by the school |
Why SASMO usually comes first
Three practical reasons, none of them about difficulty. It runs at every primary level, so there is no single year in which the chance appears and vanishes. A parent can enter a child directly without the school's involvement. And it publishes its award percentages, so you can judge in advance what a realistic outcome looks like.
NMOS fails all three of those tests — not because it is a worse contest, but because it is built differently. It is school-gated, P5-only, and silent on cut-offs.
What each tells you before you enter
SASMO tells you the shape of the outcome: Gold is the top 8% of the field, and the bands below it are fixed shares too. You can decide whether that is a bet worth taking.
NUS High publishes the award tiers but no percentage or percentile cut-off for any of them. Any "top X% gets Gold" figure you find for NMOS is a third-party estimate, not the organiser's. We would rather tell you the split is unpublished than repeat a number nobody stands behind.
Can a child do both?
Yes — they are separate contests with separate papers, and nothing stops a P5 pupil sitting both if the school registers for NMOS. The question is whether it helps.
A child sitting a first olympiad should sit one paper. Three contests in eight weeks teaches time pressure, not mathematics.
For a child who already enjoys contest problems and has sat at least one paper, both in the same year is reasonable. For a child meeting this style of question for the first time, doing both mainly teaches them what it feels like to be under time pressure twice.
The short version
If you are choosing one: SASMO, at whatever level your child is in now. If your child is in P5 and the school offers NMOS, it is a genuine opportunity that does not return — but it is a better second contest than a first one.
Sources
Last verified: 2026-08-05
Curious where your child actually stands?
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