You can take 13 to Braddell Rd then 163. Alight right after the
intsersection with Lor 6 Toa Payoh. You alight at the sembawang
baptist church and walk in.
The nearest MRT is Yio Chu Kang. Although i dun remember there
being any direct bus from there. You can alight at Ang Mo Kio
instead and take 169.