However, political opinion polls typically are based on only .001 percent of the population. More importantly, we don't know what percentage of GM car owners received the survey. The other choices can be quickly dismissed. The test is given year-round. You can take the test during normal business hours, in the first three weeks of each month.
Weekends are also available in many locations.
You can register as late as the day before the test, but spaces do fill up. So it's best to register a couple of weeks before you plan to take the test. Most people are better off preparing thoroughly for the test, taking it one time and getting their top score. You can take the test as many times you like, but many graduate schools will average your scores. You should call the schools to which you are applying to find out their policy.