SPM Biology PAPER 1 (4551/1)
Questions are evenly distributed, so there are no chances for you to skip any chapter. So work hard on these important chapters.

Paper 1 hot Topic 2013
Form 4 Chapter 2 - Cell Structure and Cell Organisation
Form 4 Chapter 3 - Movement of Substances Across The Plasma Membrane
Form 4 Chapter 6 - Nutrition
Form 5 Chapter 10 - Transport
Form 5 Chapter 12 - Coordinates and Responses
Form 5 Chapter 13 - Reproduction and Growth
Form 5 Chapter 14 - Inheritance

Topic with average 2 questions every year :
Form 4 Chapter 5 - Cell Division
Form 4 Chapter 7 - Respiration
Form 5 Chapter 11 - Support and Locomotion
Form 5 Chapter 15 - Variation

Totally not important : 
Form 4 Chapter 1 - Introduction To Biology (0 questions every year)


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SPM Biology PAPER 2 (4551/2)

Section A - Structure
Form 4 Chapter 4 - Chemical Composition of the cell
Form 4 Chapter 6 - Nutrition
Form 4 Chapter 7 - Respiration
Form 4 Chapter 5 - Cell Division
Form 4 Chapter 8 - Dynamic Ecosystem
Form 5 Chapter 5 - Inheritance

Other important topic :
Form 4 Chapter 2 - Cell Structure and Cell Organisation
Form 5 Chapter 2 - Support and Locomotion
Form 5 Chapter 3 - Coordination and Response


Section B - Essay
Form 4 Chapter 9 - Endangered Ecosystem
Form 5 Chapter 1 - Transport
Form 5 Chapter 3 - Coordination and Response
Form 5 Chapter 4 - Reproduction and Growth

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SPM Biology PAPER 3 (4551/3)

Form 4 Chapter 3 - Movement of Substances Across the Plasma Membrane
Form 4 Chapter 4 - Chemical Composition of the Cell
Form 4 Chapter 6 - Nutrition
Form 4 Chapter 7 - Respiration
Form 4 Chapter 8 - Dynamic Ecosystem