The top PSLE Score for this year seems to be 286, from RGPS (Raffles Girls Primary School).
Close runners-ups are 283, from NYPS (Nanyang Primary School) and Nanhua.
Source is from https://www.kiasuparents.com/kiasu/t-scores/, which is self-reported by parents. Casting aside the “troll scores” of 299 or 300 which are not believable, this seems to be the most accurate top PSLE score available, since the mainstream media are not allowed to report them.
Congratulations for those who have done well. And for those who have not, do not be discouraged as there is still a long road ahead, and there will be many opportunities to prove yourself.
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From experience, O Level is a completely new ball game from PSLE. It is possible for relatively weak students in PSLE to do very well in O Levels, and also vice versa; for quite strong PSLE students to do poorly in O Levels. It is a new beginning for students.
2017 Update: Highest PSLE score seems to be 285 from Nanyang Primary. The runner-up position seems to be tied with a few schools such as MGS, ACS, Ai Tong, with 281.
Note that neighborhood schools can produce very strong results too: Alexandra Primary School and Admiralty Primary School both produce 280 scorers. In fact I recall from memory that Rulang Primary School used to consistently produce top scorers that can even rival that of Nanyang Primary School.