What Is a Good IGCSE Grade? A Parent's Guide to the Grading System

If your child is studying for their IGCSEs, you've probably found yourself asking: what actually counts as a good grade? The answer depends on which exam board your child is sitting, what they plan to do after IGCSEs, and how competitive their next step is. This guide breaks it all down clearly so you can set realistic expectations and help your child aim for the right targets.

How the IGCSE Grading System Works

The first thing that catches most parents off guard is that there isn't one single IGCSE grading scale. There are two, and which one your child receives depends on their exam board.

Cambridge (CIE) IGCSE uses the traditional A* to G scale, where A* is the highest grade and G is the lowest passing grade. This is the same system used for decades across the UK and international schools worldwide, and it's what most parents will be familiar with.

Edexcel IGCSE uses the newer 9 to 1 scale, where 9 is the highest and 1 is the lowest. This is the same system now used for GCSEs in England.

The two scales don't map onto each other perfectly because one has eight passing grades and the other has nine, but the approximate equivalences are:

• 9 = high A*
• 8 = low A*
• 7 = A
• 6 = high B
• 5 = low B / high C
• 4 = low C
• 3 = D/E
• 2 = F
• 1 = G

The key anchor points to remember: a grade 4 is broadly equivalent to a C, and a grade 7 is broadly equivalent to an A.

What Counts as a Pass?

Technically, the lowest passing grade is a G (or a 1 on the numerical scale). Anything below that is "ungraded," meaning the student didn't meet the minimum standard.

However, in practice, most schools, sixth forms, and universities consider a grade C (or grade 4) to be the real pass mark. This is the minimum grade that's typically accepted for progression to A-Levels or IB, and it's the baseline that most employers and institutions recognise.

So while a D is technically a pass, it's unlikely to open the doors your child needs.

What Counts as a "Good" Grade?

This is where context matters. A good grade depends entirely on what your child is aiming for next.

For most students, grades in the A to B range (7 to 6) represent strong performance. These grades show solid understanding of the subject and will keep most doors open for A-Level or IB study.

For competitive pathways like medicine, Oxbridge applications, or top international sixth forms, you're really looking at A* and A grades (8 and 9) across the board. These students need to demonstrate consistently high performance, and IGCSE grades form part of that picture even when universities are primarily looking at A-Level or IB results.

For students who find maths challenging, a solid B or C (5 or 6) in IGCSE Maths is still a meaningful achievement, especially if they don't plan to continue with the subject. A grade C meets the minimum entry requirement for nearly all post-16 courses.

Cambridge IGCSE: Core vs Extended and Why It Matters

If your child is sitting Cambridge IGCSE Maths, there's an extra layer to understand: the Core and Extended tiers.

Core papers cover a narrower range of content and cap the maximum achievable grade at C. Extended papers cover the full syllabus and allow students to achieve grades from A* down to E.

This means a student on the Core pathway cannot achieve higher than a C, regardless of how well they perform. If your child is capable of a B or above, they need to be entered for Extended. This is worth checking with their school, because the decision is sometimes made earlier than parents realise and it directly limits what grade is possible.

Edexcel International GCSE uses different terminology but has a similar tier system: Foundation tier (grades 5-1) and Higher tier (grades 9-4). Foundation students cannot achieve higher than a grade 5, so the same principle applies — check which tier your child is entered for.

Grade Boundaries Change Every Year

One thing that catches parents out is that the percentage needed for each grade isn't fixed. Grade boundaries are set fresh after every exam session based on how difficult the paper was and how students performed overall.

For example, an A* in IGCSE Maths might require 85% one year and 78% the next. This is deliberate. It means that a grade A in 2026 represents the same standard of achievement as a grade A in 2025, even if the papers were different in difficulty.

The practical takeaway: don't fixate on percentages. A student scoring 75% on a mock paper might be on track for an A or a B depending on the paper's difficulty. Past paper practice using official mark schemes and grade boundaries is the best way to calibrate expectations.

What IGCSE Grades Do You Need for A-Levels?

A-Levels are the most common next step for IGCSE students in the Cambridge pathway, and most sixth forms set minimum IGCSE entry requirements by subject.

As a general rule, most schools require a minimum of a B (grade 6) in the subject you want to study at A-Level. For more demanding A-Level subjects like Mathematics, Further Mathematics, Physics, and Chemistry, many schools ask for an A or A* (grade 7 or above) at IGCSE.

Some international schools are more flexible, but the principle holds: the stronger your IGCSE grade in a subject, the better prepared you'll be for the jump to A-Level. The gap between IGCSE and A-Level is significant, and students who scrape a minimum entry grade often struggle in the first term.

For IGCSE Maths specifically, if your child wants to take A-Level Maths, they should be aiming for at least an A (grade 7), and ideally an A* (grade 8 or 9). A-Level Maths builds directly on IGCSE content, and any gaps at IGCSE level become serious problems very quickly.

What IGCSE Grades Do You Need for the IB Diploma?

Many international schools offer the IB Diploma Programme as an alternative to A-Levels. Entry requirements vary by school, but the expectations are similar.

Most IB schools expect a minimum of a B (grade 6) in subjects you plan to take at Higher Level, and a C (grade 4 or 5) in subjects at Standard Level. Competitive IB schools or those with strong academic reputations may set the bar higher, particularly for Higher Level Maths and Sciences.

For IB Maths specifically, if your child plans to take Mathematics: Analysis and Approaches at Higher Level (the more rigorous option), they should realistically be achieving an A or A* at IGCSE. The HL Maths course is demanding and assumes a very strong IGCSE foundation.

Do IGCSE Grades Matter for University?

This is a question that comes up constantly, and the honest answer is: it depends on the university.

For the majority of universities worldwide, your child's A-Level or IB results will carry far more weight than their IGCSEs. Most universities make offers based on predicted or actual post-16 grades, not IGCSE performance.

However, there are important exceptions.

UK universities do look at IGCSE/GCSE grades as part of the application, particularly for competitive courses. Oxford, for example, states that successful applicants typically hold a high proportion of grades 7, 8, and 9 (A and A*) at GCSE/IGCSE level. For medicine, most UK medical schools expect a minimum of grade 6 in IGCSE English, Maths, and Sciences, with competitive applicants typically achieving 7 to 9 across the board.

US universities take a more holistic view, but strong IGCSE grades still form part of the academic transcript and contribute to the overall picture. An A* at IGCSE is broadly equivalent to an A in the US GPA system.

Other international universities in Europe, Asia, and the Middle East generally recognise IGCSE grades and may factor them into admissions, particularly where the student hasn't yet completed A-Levels or IB at the time of application.

The bottom line: even if IGCSEs aren't the main event, they matter more than many families assume, especially for competitive pathways.

What If My Child's Grades Aren't Where They Need to Be?

First, don't panic. IGCSE is a two-year course and there's often more time to improve than parents think, particularly if weaknesses are identified early.

Second, understand that IGCSE Maths in particular is a subject where targeted support makes a huge difference. Many students who struggle are dealing with specific gaps from earlier years rather than a lack of ability. Once those gaps are addressed, progress can be surprisingly fast.

Third, remember that students can resit IGCSEs. Both Cambridge and Edexcel offer multiple exam sessions per year (typically May/June and October/November), and there's no limit on the number of attempts. Universities and employers will typically only see the best grade achieved.

If your child is aiming for a specific grade in IGCSE Maths and isn't on track, the most effective approach is usually a combination of targeted work on weak topics, regular past paper practice under timed conditions, and focused exam technique coaching.

Quick Summary: What Grades to Aim For

I'm a UK-qualified maths teacher (QTS) with over 8 years of experience helping international school students achieve top grades in Cambridge and Edexcel IGCSE Maths. If your child needs support reaching their target grade, get in touch to find out how I can help.