This is the issue with a test like the Watson Glaser - it's impossible to know with 100% certainty which exact questions you're getting right and wrong - to protect the integrity of the test.I do not know, but I sent them an email requesting my WG results because I need to know what I am doing wrong.
I am going to send my request 3 times, if they do not answer then I am going to send a freedom of information request. How am I supposed to improve if I do not know my mistakes?
I've found that my score only improved after having subscribed for paid WG resources which tell you exactly where you're going wrong with a detailed answer key. Nevertheless, there are a few free tests online that actually give you an answer key explanation for where you're going wrong!