Complex sentence: Students from the affiliated school who wish to enter St. Gabriel's Secondary School for the Express stream must get a PSLE score of at least 220, others have to get a PSLE score of about 240.
Split into simpler sentences: Students from the affiliated school who wish to enter St. Gabriel's Secondary School for the Express stream must get a PSLE score of at least 220. Others have to get a PSLE score of about 240.