S3 & S4 Chemistry
Teaching starts with Unit 1 (Chemical Changes and Structure) and a majority of Unit 2 (Nature's Chemistry) is taught before the end-of-year S3 exam. The completion of Unit 2 leads into the SQA Assignment, which is completed in October/November.
Unit 3 (Chemistry in Society) is started prior to the January Prelim. You then have a mock exam, covering all of the course content, just before you go on Study Leave.