Twenty-five minutes, free, and you get something back at the end whether or not you ever speak to us.
This will not tell you what you will be good at. No questionnaire can. What it does is widen the list of directions worth looking at, and tell you how much weight to put on what it says.
Your school results matter more than this does. They relate to how you do at university far more strongly than any personality questionnaire. We will ask for them, and we will say so on your report.
There are no right answers. Answering how you think you should look will only make the result less useful to you.