I did the assessments a couple of weeks ago. Three hours is a very generous amount of time given. Mine took around an hour and a half. You'll arrive and sit in the waiting room. Then they'll take photocopies of everyone's identification and documentation which takes a little while. You'll then all go into a room, go through the tests and have a small practice before taking them. The tests take 8 minutes each, and there are a lot of questions to do. It is the number of questions rather than the difficulty of them which is challenging. You'll then go back to the waiting room whilst they are marked and after a little while you'll be told whether you have failed or passed, in which case you will proceed forward to an interview at a future date.