U missed out Eunos GRC. Worker party stronghold.
Note by mod: Fixed typo error of "Eunos".
Eunos no longer pretty stronghold of WP (Yes in 1980s and 90s),
or else Aljunied would have been WP's GRC. (PAP says that 60%+ of
the votes in Eunos & Bedok Resevoir goes to PAP while the
Hougang areas --- notably "Paya Lebar" and "Aljunied - Hougang" was
almost like 1 vote is to 1 vote (Opposition might get either 49% or
51% of the votes) while Serangoon (Serangoon Gardens) area is
something for us to guess)
Personally, I guess that Eunos GRC was so close fight was due to
inclusion of Tampines North area and not Eunos / Bedok Resevoir is
opposition's stronghold, which happened that in 1991, Tampines GRC
got 40% of the opposition votes.