It is our pleasure to inform you that we now publish the 5-in-1 General Exercise Book 4&5.

This exercise book series written in accordance with the revised Chemistry and the chemistry part of the Combined Science and Assessment Guides (Secondary 4–6) released in 2014. It consist which are listed

below:

Topic 10 Rate of Reaction

Topic 11 Chemical Equilibrium

Topic 12 Patterns in the Chemical