You reached this page for answers in oDesk? You are kidding.
Here are the answers:
There's no short cut of building credibility in oDesk by cheating. Go make some sweaty preparation for the test. One tip is to open simultaneously the browser for instant research and have IDE let say for C# test on your side. C# Programming Test has lots of compile related tests and you can save some of your answers to assure correctness.
Some providers associated with companies has less than 20mins time spent on tests. You gonna be kidding! I bet they record the tests for their consultants. So that's the last tip. For a serious recorder, go seek desktop recorder like CamStudio. Remember oDesk test has almost a month of interval before you can retake the test so go take your best shot and good luck!