Unfortunately, the Singapore Biology Olympiad Committee does not publicly release past papers on their website. However, there are a few ways to access past papers:
A comprehensive collection of past papers from various national Olympiads (USA, British, Australian) that are highly relevant to the SBO difficulty level. Access them on Biolympiads.com . singapore biology olympiad past papers full
Reviewing past papers for the and its junior counterpart, the Singapore Junior Biology Olympiad (SJBO) , requires understanding that official, "full" recent papers are generally not publicly released by the organizers. Availability of Past Papers Reviewing past papers for the and its junior
Finding the paper is step one. Using it is step two. Most students do this wrong. They sit down with the paper, answer it, mark it, and move on. That will get you a Bronze or Honorable Mention. Most students do this wrong