PLEASE READ THE REVIEWS BEFORE SIGNING UP TO THIS SCAM!
I took what seemed like a very legitimate quiz before deciding to do a free trial. In the process of signing up for the free trial, they kept trying to push the full weekly (!) price of 23 pounds, to which I said no thank you. However, they asked this THREE times and I accidentally clicked on the wrong button; I then ended up being billed immediately with no confirmation.
I wrote to them and explained the problem and they have refused a refund as it is 'against their policy'. Having read other reviews, it seems the app itself is a complete scam and doesn't deliver what it promises. DO NOT sign up with these people! I have opened a dispute with my bank and am hoping the money will be refunded.