Science Optional Papers YearLevel3-6Level5-7Level5-7Level Thresholds(Grade Boundaries)2009 Paper 1 Paper 2 Paper 1 Paper 2 2008 Paper 1 Paper 2 Paper 1 Paper 2 2007 Paper 1 Paper 2 Paper 1 Paper 2 2006 Paper 1 Paper 2 Paper 1 Paper 2 2005 Paper 1 Paper 2 Paper 1 Paper 2 2004 Paper 1 Paper 2 Paper 1 Paper 2