The Core or Extended choice shapes everything in IGCSE Maths, and in Muscat it is often made early, sometimes before a student's algebra is ready for Extended questions. We check the tier against current working level in the demo lesson and plan from there. Teaching follows the 0580, 0606 and 4MA1 syllabuses used across the city's international schools, among them Cheltenham Muscat, Muscat International School and British School Muscat. Students join lessons from Qurum, Al Mouj (The Wave), Al Ghubrah, Madinat Sultan Qaboos and Al Khuwair. Tier decisions are often revisited straight after Grade 10 mocks, and a switch at that point is normal, not a setback.