Difference between the 2015 and 2016 edition

DominicClazzDominicClazz Registered Posts: 1
Hiya! I'm sitting my indirect assessment on the 21st and while revising I realized I have the 2015 edition. So I'm just wondering whats the difference between the 2015 and 2016 edition and if it is essential for me to purchase the 2016 book? Thanks
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