Mdm Koo joined the Ministry of Education in 2009. She spent one year at the National Institute of Education in Nanyang Technological University, then taught Physics and Mathematics in a secondary school from 2010 to 2015.
An opportunity to cross level opened up and Mdm Koo taught upper primary Science and Mathematics from 2016 to 2018.
Mdm Koo's videos can be found on her YouTube channel.
