Below is the timetable for promos (Chem and Physics i dont know the actual duration after breaks):

SubjectStartEndDuration
FriGP 1081509451.5
GP 2101511451.5
Physics13001530
Mon-
TuesMaths081511153
CLAO130016003
WedsChem08151105
ThursBio081510452.5
Fri-
MonBio SPA081509151


This link: http://smb.chs.edu.sg/emb/college_student/attach/0509130041599218.xls is the link to the post-promo timetable. I have condensed the timetable to only those that apply to our class. It is on the "Files" page. Direct link to file here.