If your child is taking Computing in Secondary 3 or Secondary 4, you may hear terms such as G3 Computing, K349, Python and the practical examination. The names can make the subject sound more complicated than it is.

At a high level, G3 Computing combines computing knowledge with practical problem solving. Students learn important computing concepts and also use computers to develop solutions.

Is G3 Computing the same as O-Level Computing?

From 2027, Singapore students sit the Singapore-Cambridge Secondary Education Certificate (SEC). The Computing subject at the G3 level uses syllabus code K349.

It succeeds the previous Singapore-Cambridge GCE O-Level Computing syllabus 7155. If your child, school or tuition provider still refers to “O-Level Computing”, that is why the terminology may sound familiar.

For a closer comparison, see O-Level Computing 7155 vs G3 Computing.

What do students learn in G3 Computing?

The syllabus is organised into five main areas:

Computing Fundamentals

How computers represent and process information.

Algorithms & Programming

Problem solving, algorithms and programming using Python.

Spreadsheets

Using spreadsheet features and functions to solve problems.

Networking

How computers communicate through networks and the internet.

Impact of Computing

How computing affects people, organisations and society.

This is only the high-level picture. For the individual topics and skills within each area, see G3 Computing Syllabus: What Students Learn.

Does G3 Computing involve Python?

Yes. Python is the programming language specified in the G3 Computing syllabus. It is part of the Algorithms and Programming module.

Students do more than type Python code. They need to understand a problem, work out what a program should do, read and trace code, find errors, test solutions and write or modify programs.

How is G3 Computing assessed?

Students take two compulsory papers.

Paper 1
60%

Written examination

Duration: 2 hours

A written paper covering the five syllabus modules.

Paper 2
40%

Lab-based examination

Duration: 2 hours 30 minutes

A practical examination covering Algorithms & Programming and Spreadsheets.

This combination matters: G3 Computing is not a subject where students only memorise definitions. They are also expected to apply what they know using a computer.

Is G3 Computing like Maths?

In one important way, yes. In Maths, knowing a formula is different from recognising when and how to use it in an unfamiliar question.

Computing has a similar challenge. A student may understand what a Python loop does when shown an example, but a new problem may require them to decide whether a loop is needed, what should happen inside it and how to test whether the solution works.

Knowing the concept is only part of the task. Students also need to recognise when and how to apply it.

Frequently asked questions

What does G3 mean?

G3 refers to the subject level under Singapore's secondary education system. G3 subjects generally correspond to the level associated with the former Express course.

What is K349?

K349 is simply the syllabus code for G3 Computing from 2027. Parents do not need to memorise the code; it identifies the official syllabus used for the subject.

Is Python the whole G3 Computing syllabus?

No. Python is an important part of Algorithms and Programming, but students also study Computing Fundamentals, Spreadsheets, Networking and the Impact of Computing.

Is there a practical Computing exam?

Yes. Paper 2 is a 2 hour 30 minute lab-based examination worth 40% of the subject. It assesses Algorithms & Programming and Spreadsheets.

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