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In the revision section are two pages - Unit 6-11 (Hard) and Unit 12-15 (Hard) (it may have distributed to your revision section). 

These are questions on these topics that are more challenging and thought provoking, often requiring some element of critical thinking rather than just skill. I am warning you, some of these are harder than what is required from you, so do not panic or stress if you can’t do them. Even the problem solving questions often found at the back would not be as hard as some of these questions. However they are an excellent way to deepen and strengthen your understanding of the topics. 

This is completely optional and only because many of you asked for more challenging questions. 

Answers are included. If anyone wants a worked solution/explanation to it, email me and I will do so. 

Miss Shah