A quick good search will find you some data...
The median gross monthly salary in 2016 for both fresh and post-national service graduates was S$2,200. In 2017, this figure increased to S$2,235.
When analysed by polytechnic courses, the data showed that students who graduated from health sciences earned the most compared to their peers from other courses, at S$2,450 in 2016 and S$2,500 in 2017.
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https://www.channelnewsasia.com/news...o-find-9856000