Tampine 5 Rooms selection may refer to the below link from the fenghui master comments:
https://www.geomancy.net/forums/topic/16004-hdb-tampines-greendew-launched-in-february-2018/
Base on comment from internet source below are the summary on the 3 block for Tampines Green Dew:
Block 647A:
1) Stack #xx-199 and #xx-201 South-East Facing. Was left with 6 floor and below. Do note the low floors will be facing and lower than the 8 storey car park. Will have morning sun and minimum afternoon sun (from Sept to Mar of the year). Rating: Average (2 stars **)
2) Stack #xx-195 and #xx-197 North-West Facing. Will be facing the pavilion, so should avoid the low floor. All units will be subject to afternoon sun throughout the year. Neutral (1 star *)
3) Stack #xx-183 and #xx-185 North-West Facing. All units will be subject to afternoon sun throughout the year. Will be block cos facing 4 opposite units. #xx-183 master bedroom wall will be subject to afternoon sun, may be very hot. #xx-185 should be better cos master bedroom wall is subject to morning sun so not so hot in the room. Rating: Rating: Not recommended (0 star)
Block 648A:
4) Stack #xx-121,#xx123 and #xx-125 North-West Facing. All units will be subject to afternoon sun throughout the years. Should avoid #xx-125 cos it main door facing the rubbish bin diagonally. Rating: Neutral (1 star *)
5) Stack #xx-119 and #xx-117 South-East Facing. All units will be have morning sun and minimum afternoon sun. #xx-119 master bedroom wall will be subject to afternoon sun, may be very hot. #xx-117 should be better cos master bedroom wall is subject to morning sun so not so hot. Will be facing 2 opposite units only. Rating: Good (3 stars ***)
Block 648B:
6) Stack #xx-151, #xx-149 and #xx-147 South-West Facing. All units will be subject to afternoon sun throughout the year. #xx-149 master bedroom wall will be subject to afternoon sun, may be very hot. #xx-147 should be better cos master bedroom wall is subject to morning sun so not so hot. Should avoid #xx-151 cos it main door facing the rubbish bin diagonally. All units unblock facing road. Rating: Neutral (1 star *)
7) Stack #xx-143 and #xx-145 North--East Facing. All units will be have morning sun and minimum afternoon sun. #xx-143 master bedroom wall will be subject to afternoon sun, may be very hot. #xx-145 should be better cos master bedroom wall is subject to morning sun so not so hot. Do note that opposite unit #xx-179 corner is pointing at #xx-145 (poisonous arrow), very bad in tern of fenghui. #xx-143 also facing the corner of the opposite units (179 & 177). Rating: Average (2 stars **)
Block 648C:
9) Stack #xx-159 and #xx-157 South-West facing. All units will be subject to afternoon sun throughout the years. #xx-159 master bedroom wall will be subject to afternoon sun, may be very hot. #xx-157 should be better cos master bedroom wall is subject to morning sun so not so hot.All units unblock facing road. Rating: Neutral (1 star *)
10) Stack #xx-169 and #xx-171 North Facing.Was left with 6 floor and below. Do note the low floors will be facing and lower than the 8 storey car park. Will have minimum morning sun and minimum afternoon sun. Very near to nursing home. Rating: Average (2 stars **)
Hope the above is useful for those going for tampines 5 room selection.
Good luck to all.