What is IGCSE, and how does it work? See the subjects, grading scale, and pathways after IGCSE — plus how it compares with the IB.

What Is IGCSE? Curriculum, Grading Scale and Pathways After It

What exactly is IGCSE? It's a question many parents ask when looking into international pathways for a child aged 14–16. The qualification helps students build an academic foundation before moving on to A-Level, the IB Diploma, or other pre-university routes. This Westlink guide walks parents through the subject structure, grading scale, the certificate's real value, and how IGCSE compares with the IB.

What Is IGCSE, and Who Awards It?

Many parents have heard of IGCSE but still aren't quite sure what it actually is. Getting this right from the start makes it easier to choose the right pathway for your child.

What Does IGCSE Stand For, and What Age Is It For?

IGCSE stands for International General Certificate of Secondary Education — in effect, an international secondary-education certificate.

It's taught in English, for students aged roughly 14–16 — in Vietnam, this typically corresponds to Grades 9 through 11.

The IGCSE certificate is awarded by Cambridge Assessment International Education (CAIE), a division of the University of Cambridge in the United Kingdom.

Other awarding bodies, such as Pearson Edexcel, offer an equivalent International GCSE. That said, Cambridge IGCSE remains one of the most widely used at international schools in Vietnam.

On completion, students receive a separate certificate for each subject, which forms the foundation for moving on to pre-university programmes.

Is IGCSE Based on the British System, or Is It a Genuinely International Qualification?

IGCSE developed out of the UK's GCSE and O-Level qualifications, which is why many people are used to calling it "the British system".

However, IGCSE has since been redesigned for an international student body. Its content draws on international examples and contexts, rather than being centred solely on the UK.

In other words, IGCSE isn't tied rigidly to any one country's education system — which is why the certificate is so widely recognised internationally.

IGCSE is a widely recognised international secondary qualification

IGCSE's Value and How Widely It's Recognised Globally

IGCSE's greatest value lies in how widely it's recognised internationally. The certificate is accepted by schools and education authorities around the world.

Cambridge IGCSE is currently taught across a large number of countries and territories, with a single common standard applied at every participating school.

This creates consistency in how results are read: a student who scores an A in Hanoi can be understood as equivalent to a student scoring an A anywhere else.

For parents planning for their child to study abroad, this is a clear advantage — an IGCSE certificate is easy for admissions teams across many different education systems to read and understand.

Universities, particularly in the UK, Australia and Canada, often take IGCSE results into account, with some requiring a minimum of 5 subjects graded C or above as part of their entry requirements.

Strong results can also work in a child's favour when applying for scholarships later on, as they demonstrate an academic foundation built early.

The IGCSE Curriculum Structure and Subjects

One thing that appeals to parents is just how flexible IGCSE is — students choose subjects based on their ability, interests and individual goals.

Subject Groups and How Many Subjects to Take

Cambridge IGCSE offers more than 70 subjects. Students typically choose around 5–14 subjects, with 6–7 being the most common.

Subjects fall into 5 main groups:

• Group 1 – Languages: English and other foreign languages.

• Group 2 – Humanities and Social Sciences: History, Geography, Economics, Business.

• Group 3 – Sciences: Physics, Chemistry, Biology.

• Group 4 – Mathematics.

• Group 5 – Creative, Technical and Vocational: Art, ICT, Computer Science.

Most schools require students to choose subjects across several different groups, with the aim of keeping their education broad, balanced, and not too narrowly specialised too soon.

To receive the combined Cambridge ICE (International Certificate of Education) award, students need to pass a minimum of 7 subjects spanning all 5 groups, with specific requirements for how many subjects come from each group.

The curriculum is built around five main subject groups

How Do the Core and Extended Levels Differ?

Many IGCSE subjects are offered at two levels — Core and Extended — and students choose a level based on their ability in each individual subject.

The Core curriculum covers foundational content, with the achievable grade range capped (typically from C to G).

The Extended level is harder and covers more ground, and is the only level that allows students to reach the very top grades.

Students don't have to take the same level across every subject — a child can take Extended in subjects they're strong in and Core in subjects they're still building confidence with.

This flexibility helps ease the pressure on students, and is one of the reasons IGCSE suits such a wide range of ability levels.

IGCSE Grading, Pass Marks and Exam Sessions

Understanding how grading works helps parents read a child's results accurately — a part many articles only cover briefly.

The A*–G and 9–1 Grading Scales

IGCSE uses two grading scales, depending on the subject and awarding body. The most common is the letter scale from A* to G.

On this scale, A* is the highest grade, descending down to G. Some subjects instead use a numeric scale from 9 to 1, where 9 is the highest grade.

The 9–1 scale is most commonly seen on UK exam papers, while the A*–G scale remains widely used internationally.

A pass is generally counted as a grade C or above, equivalent to a 4 on the numeric scale — meeting this bar means a student has satisfied the basic requirements of the subject.

Note: this table is for general reference only — the exact conversion can vary by subject and awarding body.

Exam Schedule and When Results Are Released

IGCSE exams are usually held twice a year — one session around May–June, and another around October–November.

Results come out a few months later — typically in August for the mid-year session, and around January–February for the end-of-year session.

The exact schedule can vary between schools and awarding bodies, so parents should confirm the dates directly with their child's school.

Having two exam sessions adds flexibility, giving students the chance to improve their grade in subjects that didn't go as well as hoped.

What Comes After IGCSE?

IGCSE isn't the end point of an international pathway — it's a stepping stone towards pre-university programmes.

The A-Level Route

A-Level is a common choice after IGCSE, particularly for students aiming for the UK. Students typically study 3–4 subjects in depth.

This route suits students who already have a clear idea of their field of study — going deep into a small number of subjects helps prepare them thoroughly for a university major.

The IB Diploma (IBDP) Route

IBDP is a broad, internationally recognised pre-university programme. Students study a balanced spread of subject groups alongside a set of core skills components.

This route suits students who want to keep a broad education. The programme also places strong emphasis on critical thinking, research and personal development.

It's worth noting that IGCSE and IB aren't entirely separate paths — at many international schools, students follow the IB continuum from early on instead.

IGCSE is a stepping stone towards pre-university programmes

How Does IGCSE Differ from IB (MYP/DP), A-Level and Vietnam's National Curriculum?

This is the part most parents actually need, yet few articles spell it out clearly. Understanding the differences helps a family choose the right pathway for their child.

The key point is that, for the same 14–16 age range as IGCSE, the IB has its own equivalent programme called the MYP. In other words, IGCSE and MYP are two different approaches to the same stage of schooling.

The table below offers a quick comparison:

No single option is best for every child. The right choice depends on your child's direction, personality and way of learning.

For families wanting their child to stay on an international pathway for the long haul, the IB continuum can help avoid a "broken chain" — your child won't need to suddenly switch systems when moving up to the next stage.

Is IGCSE or IB a Better Fit for Your Child? Choosing a Pathway and an International Continuum School

Once you understand the basics, the real question is which direction suits your child — and parents also need to know what criteria to use when choosing a school.

When to Consider IGCSE, and When to Choose the IB Continuum

IGCSE suits students who need a broad foundation before choosing a specialism. It's also a good fit when a child transfers into the international system partway through secondary school.

The IB continuum is a better fit when a family wants their child on a seamless international pathway from early on, developing critical thinking over many years rather than studying purely to pass exams.

If your child is a proactive learner who enjoys exploring and doing project work, the IB framework tends to bring out the best in them. If your child needs clear, subject-by-subject structure, IGCSE may be easier to approach.

Criteria for Choosing an International School for Your Child

Whichever direction you choose, the quality of the school is still what matters most. Parents should check a few key criteria:

• Clear accreditation: has the school been officially authorised by an international body?

• A continuum pathway: can your child progress seamlessly through each stage?

• English-language support: does the school offer an EAL (English as an Additional Language) programme for students who need it?

• A multicultural environment: does the student community represent a genuine mix of nationalities?

• Teaching staff: do teachers have an international background and solid training?

In Hanoi, one example of an IB continuum school is Westlink International School, located in the Tay Ho Tay Urban Area, Xuan Tao Ward, Bac Tu Liem District, Hanoi. Westlink is a member school of the International Schools Partnership (ISP).

Westlink follows the IB pathway and does not offer IGCSE. At middle school level (up to around age 16), Westlink students follow the MYP, before progressing to the IB Diploma at ages 16–18.

Westlink has been officially authorised as an IB World School for the Primary Years Programme (PYP) since May 2024. The school runs an IB continuum pathway, offers personalised EAL support, and has a student community representing more than 30 nationalities.

Image: Westlink runs an IB continuum pathway for its international students

These are the practical signals that help parents judge an international school's actual capability. Families shouldn't rely on marketing or a programme's name alone. Parents are welcome to speak with the school directly to compare the IB and Bilingual pathways and find the right fit for their child.

Understanding what IGCSE actually is helps parents avoid mixing up the different international pathways at secondary level. IGCSE suits some students well, while Westlink follows the IB MYP for the same 14–16 age range. If you're interested in the IB continuum in Hanoi, you can book a tour of Westlink, where the academic team can advise on the right pathway for your child.