As previous posters have said, it wouldn't be ideal to park (and leave) your car opposite a driveway where the road is very narrow.
As far as the test is concerned, you're not leaving your car in that spot for any notable time. You're only there briefly until the examiner asks you to move away again, or carry out some exercise. You shouldn't stop on yellow lines or across a driveway that's on your side of the road, but opposite a driveway that isn't being used won't be a problem for just half a minute. If you can see someone wanting to get into or out of that driveway, you should reconsider.