These are my personal notes from the old GCSE spec which helped me get full UMS- still relevant and useful for the new spec and as a basic introduction to the A level. Covers all topics- Fundamentals of computer systems, standards, ethical issues, the CPU and FDE cycle, binary and logic, memory, storage technologies, operating systems, software procurement, representation of data, data validation, networks and their topologies, the Internet, programming languages, control flow.