@sunnys
Direct answer
Student A (AL 9) would be considered first for the school, even if Student B (AL 10) put the school as their first choice. Academic merit (PSLE score) is the primary criterion for posting. The order of choices only comes into play if students have the same PSLE score and are vying for the last available vacancy. In that tie scenario, the school’s vacancy would be allocated using tie-breakers, which include the choice order among other criteria Ministry of Education Singapore.
How the posting rules apply here
The first criterion is PSLE score (AL in your example). A’s AL 9 is better than B’s AL 10, so A has priority for vacancies in that school.
The “choice order” matters only when PSLE scores are equal and both students are contending for the same last vacancy. If scores are unequal, the higher-scoring student gets the vacancy, regardless of which choice they listed first Ministry of Education Singapore.
Tie-breakers are only invoked if two or more students have the same PSLE score for the same last vacancy. In that case, factors like the order of school choices among tied candidates come into play as part of the tie-breakers
More here: https://www.askvaiser.com/share/Ghz70nzZ72Z4V_bjBfga9GTK0U7M5g2l