Unlike entry to Primary Schools, admission into Secondary Schools is based on meritocracy. PSLE results are used as key admission criteria. Discuss everything related to PSLE and selection of Secondary Schools here.
(not so nice to call yrself that) IRS refers to Independent Research Studies done by some P5 GEP students while others choose CmPS (Community Problem Solving) or 1 other project which i think is Ivp (not so sure the name).
Then again, it could be something else..SG loves acronyms of all sorts.