"Music period" (we never did anything music related - it was a period where you did what you wanted i.e. the rest of the class babbled).
"guidance" - another free period
"bible ed" - same as above - we never did any bible or religious study
"physical education" or physical torture if you like...
Got out of that one by going to the additional/advanced maths class (they used the
"free" periods for the advanced maths)..... I felt most of school was a waste because they kept on repeating the same stuff over and over again (over several years) and the teachers didn't like it if you had a different perspective. I learned to give them what they wanted to pass the subject/ standard and otherwise kept my mouth shut. :-)



You have to learn to use your time wisely and then it wont be useless.