The r/SGExams community is surprisingly helpful. Search for threads titled: "SJBO 2022 Paper discussion" or "Looking for SJBO past years." Users often share Google Drive links to scanned papers. Be cautious of missing pages, but these are invaluable.
Note: Because raw past papers are rare, use these substitutes: singapore junior biology olympiad past papers
By tutoring SJBO medalists, I have observed three fatal errors repeatedly visible when students self-grade their past papers: The r/SGExams community is surprisingly helpful
Finding the Singapore Junior Biology Olympiad past papers is one thing. Finding the solutions is another. The official answer keys rarely explain why B is correct and D is wrong. By tutoring SJBO medalists, I have observed three