How to block people from sharing their 3G connection via wifi or bluetooth ?
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you can't block connectivity between two devices that you have no control over with anything short of a jamming device.
The AP spam would work, but you'd have to spam for every named access point, and even then it isn't foolproof - the user just has to go through them one by one, or choose the one with the highest signal strength (cell phone broadcasts would be 100% strength to anyone trying to use it, most likely).
A more underhanded way would be to connect to the access points and take up all the bandwidth, but that might actually be illegal.
Here's a thought. A user usually has to be a member of the dialout group in order to use a 3G modem. (or a phone as a 3G modem). If you just remove all users from the dialout group or better still, don't make new users members of the dialout group to begin with, they should be unable to use their phones as modems.
That's a tough problem. If you provide the computer, then at least you could shut down or eliminate the wireless card and USB ports. That would potentially cut out those avenues. You probably also need to take a look at restricting what hardware students can have when taking the test. In either case, I don't think that trying to block bluetooth or wireless are really going to do the trick.