Hey Choccie,
Maths for the 11+ is around about key stage 2 level with a few of the easier topics from key stage 3. There might be things that you haven't covered in school yet (depending on your school).
Things that tend to come up are...
- Algebra basics
- Fractions
- Decimals
- Percentages
- Time
- Money
- Averages
- Sequences
- Series
- Word problems
- Prime numbers
- Prime factors
- Highest common factors
- Lowest common multiples
- Distance, speed and time
- Charts & graphs
- Angles
- Coordinates
- Geometry basics
- Nets of shapes
- Symmetry, reflection and rotation
- Ratios
- Volume, area and perimeter
- Probability
This is not necessarily a complete list. It wi11 depend on which exam you take.
Good luck!