A-Level Science subjects are pure science subjects. The topics learned at A-Level are a continuum from O-Levels pure sciences. However, at A-Level, a higher level of process skills and deeper appreciation of the scientific theories and concepts are required. Many a time, students are required to apply learned concepts in any given situations, instead of regurgitation or memorisation of facts. Many O-Level pure science students expressed that the A-Level subject requirement is a quantum jump in comparison to O-Level, it will be even more so for students who had offered only combined science.