Students study one prescribed subject, covering two cross-regional case studies and two world history topics. Students doing the HL will cover three additional topics based on a specific region, and all students must complete the internal assessment (IA)—a historical investigation into a topic of their choice. SL students will sit two final exam papers, while HL students will sit three. The first exam is source based, and students are expected to demonstrate their ability to use historical sources. The second and third exam papers require students to write essays; students should be able to formulate a thesis and use their knowledge and analytical skills to support it.