For the most part people will not recognise these minor differences and honestly if they have arrived at the phishing site, they have already failed. Because instead of a phishing site it could just as easily have been a malicious (rather than fraudulent) site and they could now be infected.
Don't click on links in unsolicited emails to go directly to a web site.
I got 6 out of ten by simply ticking the left selection, no inspection to see if I could judge a scan site. If you exclude the other two questions Nigerian 419 and SSL certificates which I knew and obviously got right, my results on just selecting the left option was 50% which possibly would have been the same for those trying to judge which was valid.
Personally I would never have arrived at those sites to have to decide, if you are going to log on to your bank, paypal, Amazon, etc. I always use either my Bookmarks or type in the URL and never from an email link.
Avoidance has got to be better than having to find minor changes, based on your memory of what the site looked like the last time you used it or looking for these grammatical errors or scare tactics, etc.