Creating linux distro for use during exam

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http://stackoverflow.com – I'm thinking about creating a liveCD having some linux on it. The distro (let's call it Exam OS) is meant to be used by students during an exam and should be, at least, unpleasent to bypass. Let's assume that students can come with their own notebooks and they receive a bootable Exam OS on CD. The distro should be characterised by: limited network access (preferably only to wolframalpha.com and / or Overlord Server [verifying users]) - no communication with other students and the external web limited packages (but on the other hand some added like Maxima) The second point is, what I belie (HowTos)