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Application for Land Economy at Cambridge - Prior reading

Being from Australia, I am foreign to the personal statement system. I was wondering if anyone had any tips for apply to Land Economy at Cambridge.

Everyone says that you should have done prior reading and be prepared to talk about that in your interview. However, as Land Economy is multi-disciplinary degree that focuses on Economics, Law, and the Environment, and it is not a commonplace subject I am unsure of how to approach this. I am currently doing the IB, doing HL Economics, so do you think it will be necessary to do prior reading for economics?

Also, are there any general tips for the interview and PS. If there are any successful applicants on this forum then I would really appreciate some advice. Thanks.