The full Edexcel specification is here.
Condensing it slightly, the units contain the following topics (with higher-tier specific topics in bold).
The Revision Guide gives a "page to a topic" summary of each part.
Unit 2
1. Number
- The four operations
- Factors and multiples
- Cubes, roots and squares
- Index Laws
- Standard form
- Surds
- Fractions, decimals and percentages
- Inverse operations
- Accuracy
- Recurring decimals
- Finding percentages
- Ratio
2. Algebra
- Expressions
- Factorising
- Formulae
- Rational expressions
- Sequences
- Coordinates in 2-D and 3-D
- Straight line graphs
- Gradients of lines
- Real life graphs
3. Geometry
- Angles and triangles
- Quadrilaterals
- Symmetry
- Polygons
- Parts of a circle
- Perimeter and area
- Circle theorems
- 3-D shapes
- Volume
4. Measures
- Scales and measures
- Compound measures
Unit 1
1. Statistics
- Handling data cycle
- Data collection
- Data Representation
- Analysing data
- Interpreting data
- Sampling
- Box plots, histograms and cumulative frequency
2. Probability
- Probability measures
- Relative probability
- Mutually exclusive outcomes
- Mutually exclusive and independent events
- Tree diagrams
- Addition and multiplication of probabilities
3. Number
- Four operations
- Decimals
- Percentages
- Equivalent fractions
- Compound interest
- Accuracy
- Use of calculators
4. Algebra
- Notation
- Graphs
- Graphs of functions
5. Geometry and Measures
- Angles at a point
- Scales and units
Unit 3:
1. Number:
- Calculations with standard form
- Proof with recurring decimals
- Using percentage and repeated percentage change
- Compound interest
- Reciprocals
- Upper and lower bounds
- Using calculators
2. Algebra:
- Equations
- Quadratic equations
- Changing the subject of the formula
- Inequalities
- Trial and improvement
- Simultaneous equations
- Graphs of functions
- Graphs of loci
- Quadratic graphs
- Direct and indirect proportion
- Transformation of functions
3. Geometry:
- Congruence
- Pythagoras’ Theorem
- Trigonometry (sine, cosine, tangent etc)
- Area of triangle using 1/2 a b s i n C
- Circle theorems
- Transformations
- Constructions
- Loci
- Mensuration
- Vectors
4. Measures
- Bearings
- Scale drawings