Computer Systems is all about understanding how computers work under the hood. From how they store and process data, to the hardware inside, and even how they stay safe and use energy responsibly.

This section is packed with facts and key knowledge. The good news? Unlike the other units there’s no problem solving — it’s all about remembering and understanding how the different parts of a computer work together. If you put the time in, you can aim for 100% in this part of the exam.

You’ll cover:

• Data Representation – how text, numbers, images, and sound are stored in binary.

• Computer Structure – the hardware components that make everything work.

• Environmental Impact – how computers affect the planet and what we can do about it.

• Security Precautions – how data is kept safe from hackers and malware.