Very easy de lah, except for the green line. It can be confusing
some times. Next time you take MRT, take a look at the direction
board. We have 2 different platforms going to different
places.
How to check:
Look at the direction board of Platform A. The words in grey means
the train is not going to those areas. Then just turn yourself
around and wait for the train in Platform B.
If you need to switch lines, listen carefully for the instructions.
Taking red line train you need to alight at either Dhoby Ghout,
City Hall, Raffles Place, Jurong East or Outram Park depending on
where want to go. Alight at Dhoby Ghout or Outram Park if you want
to take purple line. Alight at City Hall or Raffles Place if you
are switching to green line. Do the reverse when you want to go
back home. 
