You will fall ill several times in the year due to stress.
You will hate Human Biology for the rest of your life once you've finished the course.
All-nighters and cramming the day/night before the exam doesn't quite work for Highers.
You will become acquainted with the kettle and coffee which results in you drinking more than you should.
You can pretty much say bye to a constant sleep pattern throughout the year.
Your first prelim will come along and hit you full force like you've just run into a brick wall.
The SQA men will be watching over you as you sleep each night, they're just very good at disappearing when you open your eyes.