What are the most important chapters to study?
Virtually everything. Just like Science, Geography is quite unpredictable, especially in the Short Questions (though it's easier to predict the Long Questions). I would say that these would be the most important (considering you do not do the Long Questions of the chapters left out here):
- Shaping Earth's Crust
- The Earth
- Rock types (only the group names and examples of each)
- Maps & Photographs
Settlement is the least important out of them all.
But remember, ANY part of the course can come up in Short Questions.