The Singapore education system is modelled after the British GCSE & GCE.
there are 4 levels of education in Singapore
the lowest level is pre-primary, aka kindergarten. it is 2yr long.
the next level is primary school - 6yr long.
the next level after primary school is secondary school - 4yr long. at the end of 4years, secondary school students have to take the Cambridge-Singapore GCSE examination. it is so much harder than the British equivalent.
Students who fare well for GCSE will enter junior college to do a 2yr GCE A-level course, before entering universities.
Students who do not fare very well for GCSE normally opt for polytechnic. They will spend 3yr studying a vocational diploma. There are many vocational diplomas available, from law, business, accountings, chemical process technology to aeronautics, electrical engineering, computing, education, mass communication. however, there is no diploma course in Singapore on psychology, literature, or any specialised social science.