Check out these resources for tests to check your personality profile against your chosen career or use them to find your dream job.
A lot of employers use psychometric profiling tools these days to find the right person for the job, if you're a really bad fit, you might want to rethink your choice. It is very difficult to fool psychological personality tests, the best advice is not to even try as you can throw up some really peculiar spikes in the charts if you're not careful. Be yourself when taking these tests and don't try to second guess them.
Most of these sites need an e-mail address to allow you to take the test. That's their business model and fair play to them. You can use a use once disposable e-mail from mailinator to prevent follow up emails.