Does any one have a link to buy previous 11+ exam papers for CSSE and CEM?

You cannot (legally) buy genuine CEM papers, because the only ones they produce, apart from the real thing used in the exam, are the short familiarisation papers put up on the website of each organisation that uses the CEM selection tests.

Presumably you have already purchased the CSSE papers currently available on the CSSE website? Other than that, I suppose some people may try selling them on eBay or wherever (despite them being copyright).

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Outside of a dog, a book is a man's best friend. Inside of a dog it's too dark to read.Groucho Marx