Ya thats not necessarily true, I am constantly changing my lane position, mostly based on traffic and road conditions.
+1
And changing lane position semi-unpredictably so cagers won't think they can take the 2/3rds of a lane that I'm not currently using though they'll still try it anyway.
As for the computer test, don't worry about it and now keep learning.
The one question I missed on the test was when parking downhill, you're apparently supposed to turn the handlebars to the right. In reality it'll fall over if I do that. They had no correct real world answer on the test.
cresting a hill on a two-lane road
If it's a rapidly arcing hill, I'll stand up to get a better view of what's coming over it. It also allows cagers to see me sooner. Saved my derrier a few times.