Towards the end of last school year (201213), the great members of the KSA maths department did an analysis of the topics coming up in the first 50 marks in GCSE maths higher papers. We looked through a stack of Edexcel and AQA papers from the last few years. Here are our results (interpret them with caution!)
Noncalculator
 Increase in the proportion of algebra questions
 Decrease in the proportion of number questions
Breakdown
Topic  Subtopic  Frequency 
Number  Four operations with fractions  4 
Percentages  3  
Estimation  2  
Standard form  2  
Sharing into a ratio  2  
Algebra  Solving equations  8 
Forming equations  6  
Expanding brackets  3  
Factorising  3  
Substitution  3  
Geometry  Transformations

83 2 2 1 
Angle rules – mainly parallel lines  6  
Interior/exterior angles  4  
Area (Parallelogram/compound)  4  
Circles (Area/circumference)  3  
Statistics  Probability (Theoretical and experimental)  5 
Scatter diagrams  2 
Calculator Paper
 Increase in proportion of geometry questions
 Decreases in the proportion of algebra and statistics questions
Breakdown
Topic  Subtopic  Frequency 
Number  Percentages (Amount. Increase/decrease, reverse)  7 
Money problems  4  
Ratio  3  
Types of number  3  
Algebra  Solving equations  9 
Forming expressions  5  
Expanding brackets  4  
Substitution  3  
Inequalities  3  
Geometry  Area (triangles)  6 
Angles (Triangles, at a point)  4  
Bearings  3  
Circles  3  
Statistics  Probability  6 
Averages  4  
Questionnaires  2 
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Good article