Thanks for your replies.
Perhaps I did not state clearly, I need to alight at Tanah Merah
MRT Station, because I can take the shuttle service to my workplace
from there.
Either that or Expo station, then I walk to my building, which is
roughly 15 minutes away.
You think No. 168 to Tampines MRT to Tanah Merah MRT will be the
most time-saving?