What I did when I was posted there for a few months:
MRT to Tampines.
969 from Tampines to Yishun MRT.
169 from Yishun MRT to Nee Soon Camp.
There may be other better ideas.
this is the best liao lah...
969 goes direct on expressway from TPE to SLE out
and on 969, u can also sit for 3 more stops (after the
yishun mrt bus stop) to Chong Pang there, then take either 167
or 980.
