With respect, it's CATHOLIC HIGH SCHOOL, not 'Cat' High...we
haven't degraded into a bunch of deranged felines yet... 
As for ministers coming from english-orientated schools, that is
true. Lee Senior, in an effort to applease the pre-dominantly
Chinese Ethnic population back in the 1960-70s, elected to put both
his sons into 'Chinese' Schools while Lee Wei Ling attended Nanyang
Girls.
Today, with the population speaking mainstream English, this
concern no longer exists. However, the reason why the Ruling Party
is finding heartlanders more and more difficult to wrest is due to
a lack of basic dialect. So much so that PAP threw in a
Dialect-speaking challenger into Hougang SMC to try and win back
the support taken by Low Thia Khiang.