MENSA is the largest and oldest high IQ society in the world. It is a non-profit organisation open to people who score at the 98th percentile or higher on a standardised, supervised IQ test or other approved intelligence test. Below are the two ways to qualify for admission into MENSA Singapore:
(1) Take the MENSA Singapore Admissions Test (MSAT), or
(2) Submit a qualifying test score from another approved IQ test.
Read some stories of gifted children assessed at Gifted Academy, Singapore - (i) youngest MENSA member in Singapore (ii) Smartest kid? (iii) Gifted? (iv) The 5 Show 2015.
Source: MENSA Singapore