You've already been shortlisted, which means they want to meet you. These cards are just a gentle way to get comfortable. There's no score and no timer. Go at your own pace, and stop whenever you like.
Having two or three real examples in mind is plenty. Most of the questions marked “Example” can be answered with one of them, and it's fine to take a moment to choose.
Keyboard: Space flips, ← → move between cards. These cards are practice prompts. Check anything specific, such as notice periods or system names, with the force or the recruitment pack.