Just heard from some sources that AJC (Anderson Junior College) Math papers are considered the most difficult of all JCs, beating RI/HCI in terms of difficulty.
Do check out this page on how to calculate JC Ranking points.
Quotes:
AJC might have the most challenging Math papers, but that doesn’t equate to having the best math results. Other schools do better (RI/HCI)
From: http://forums.sgclub.com/singapore/ajc_good_jc_386546.html
H2 Maths this year was quite easy for both paper 1 & 2. It is definitely no where of the standard of AJC Maths Exam Papers, which are famously known for very challenging questions.
From: http://doggy94-in-air.blogspot.sg/
Mathtuition88 