Finally after weeks of hard work in BMT Tekong, I finally received my posting an hour ago via the NS portal:

You are posted to SIG INSTITUTE.
Your vocation is SIG OPR – INFOCOMM2

so there goes my dream of becoming an officer.  Even the least sergeant course were not fated to fit me in, so I'll just suck my both thumbs up and hopefully this posting is a blessing in disguise!