Nothing wrong with taking it twice if you can afford it. The advice about knowing definitively whether you can improve your score doesn't totally make sense. I think most of us have an idea within a pt or two how we did by the end of the test. If you did not perform up to your minimum acceptable score then void. Retest in a couple weeks (though you may have to drive for an open seat). Or say you think you barely hit your minimum and felt like you could have done better w a different test, don't necessarily void first test but retest in a couple weeks. If on second test you feel you performed worse or about the same, then void. If you did significantly better then don't void. I did this and went from a 30 to 34 in 2 weeks, thank god. There is a lot of variation between tests, especially if you don't have everything down cold. I wouldn't recommend taking it over and over to try and get lucky but retaking once or even twice can be a useful strategy in many cases, especially using the void option. If you suck at estimating your performance this advice does not apply.