Cambridge International AS and A Level Economics Revision Guide provides guidance on tackling the different types of questions set by the examination board. It includes advice on revision and essay writing, as well as clear summaries of the syllabus content. Cambridge International AS and A Level Economics Revision Guide helps students prepare for the Cambridge examination. Cambridge International AS and A Level Economics Revision Guide provides guidance on tackling the different types of questions set by the examination board. It includes advice on revision and essay writing, as well as clear summaries of the syllabus content.