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How to understand the grading differences between IB and IGCSE
If you want a direct answer, here it is: IGCSE grading gives your child a separate certificate for every subject with a letter or number, while IB grading pools everything together into one big score out of 45.
Choosing between them for your child at an International school Bangalore depends on whether they want to show off specific subject strengths or prove they can handle a massive, interconnected workload. You must look past the numbers and understand that the grading system for IGCSE measures what you know, but the IB measures how you think.
Why IB and IGCSE Grading Systems Are Often Confusing
Most parents in India grew up with percentage marks, so these international scales feel like a puzzle. In many local boards, 90% is the gold standard. In the IB, a 7 is the top mark. In IGCSE, it might be an A* or a 9.
The IB Grading System
The logic behind IB grading is all about the “Total Score.” A student takes six subjects, and each is marked from 1 to 7. This gives a base of 42 points. But then you have the “Core,” which includes Theory of Knowledge (TOK) and the Extended Essay (EE). These extra bits can add 3 points to the total. If your child misses the Core requirements, they don’t get the diploma, even if they score 7s in all their subjects.
The IB syllabus also makes Creativity, Activity, Service (CAS) mandatory. You don’t get points for it, but you fail without it. It is a high-stakes balance. This approach works well for students who are consistent. In fact, data shows that around 81.26 % of students earned the IB Diploma in 2025, up from ~80 % in 2024. This increase shows that students are getting better at managing this complex point system.
The IGCSE Grading System
When looking at IGCSE grading, you see a much more flexible path. Students usually take these exams in Grade 10. You get a grade for each subject, usually from A* to G or 9 to 1. There is no combined total. If a student gets a 9 in Math but a 5 in Art, the Art grade does not lower the Math “score” because they stay separate.
You should know that IGCSE is a stand-alone subject qualification taken at age ~14–16 and not combined into a single total score like the IB Diploma. This makes the grading system for IGCSE perfect for students who want to focus on their best subjects before they move into a specialised IB programme school for their final years.
Key Grading Differences Between IB and IGCSE
The way teachers arrive at these grades is the real secret. IGCSE relies almost entirely on your performance in the final exam hall. IB uses “Internal Assessments,” where projects and lab reports done in class count for up to 30% of the final mark.
| Feature | IB Diploma (DP) | IGCSE (Cambridge) |
| Grading Scale | 1 to 7 (7 is highest) | A* to G or 9 to 1 |
| Final Calculation | Total points (Max 45) | Individual subject grades |
| Bonus Points | Up to 3 for TOK and EE | None available |
| Internal Work | 20-30% of final grade | Almost zero weight |
| Difficulty Levels | Higher (HL) & Standard (SL) | Core & Extended papers |
How OWIS Supports Families With IB and IGCSE Decisions
At One World International School Bangalore, we know that these numbers can feel overwhelming. We help parents see the child behind the grades. We don’t just push for high scores; we build the skills that earn them.
- Kindness First: We integrate kindness into our daily curriculum. This helps students stay calm during the high-pressure exam seasons.
- Accessible Excellence: As part of the Global Schools Group, we offer a world-class IB education at a cost that makes sense for families.
- Global Environment: We have over 70 nationalities on our campuses. This diversity helps students succeed in the IB’s focus on international-mindedness.
- Seamless Path: Since we offer the IB from the early years through Grade 12, our students don’t feel a “culture shock” when they hit the harder grading years.
- Modern Facilities: Our Sarjapur and Whitefield campuses use smart labs and collaborative spaces to make sure students actually enjoy their learning.
We focus on university preparation through our dedicated “University Connect” sessions. We make sure our students know how to present their scores to top global colleges. We want every student to feel confident in their own academic journey.
Final Thoughts
IGCSE grading helps you plan the middle years, while mastering the IB grading ensures your child is ready for the world’s best universities. Both systems have their own merits. If you want a flexible start, trust the grading system for IGCSE. If you want a total package that proves your child can handle anything, the IB is the gold standard. At OWIS, we provide the environment where your child can thrive in both.
Would you like me to show you how our specific subject combinations at OWIS can help your child reach that 45-point goal?
Visit OWIS Bangalore to see how we turn these grading systems into success stories. Contact us today to book a tour of our Sarjapur or Whitefield campus.
With campuses located in Osaka's Ikuno ward & Ibaraki's Tsukuba City, OWIS Japan delivers IB-certified inquiry-based education to children aged 3-18. We foster a multicultural environment where students grow into future-ready independent thinkers, equipped with critical thinking, creativity and a love for learning. Our commitment to rigorous academics and personal development prepares students to excel in a global landscape.
