I tried a whole lot of quiz plugins a year ago and decided to go with this one, but then never used it and deleted it again. Recently I decided that I really needed a quiz plugin and started the whole research cycle of finding the 'best' quiz plugin all over again. And as far as I'm conceed WP Pro Quiz is still the best. I think this is quite an achievement, considering it's an older plugin that hasn't been updated much. So it was well put together from the start. Kudos to the developer.
It got some bad ratings, which scared me off a little. But I had no problem installing the plugin. It works as advertised. The only problem is taking the time to read and understand the settings and setting them to your liking. You can do this for each quiz individually. It took me a while to find the setting for having all the quiz questions on one page, but it's the 4th one under quiz mode.