The app is different to the mobile optimised experience that you're currently seeing on your iPhone's Safari browser. You'll notice two things:
At the moment it isn't possible to deliver Hazard Perception Tests to iPhones because their browsers don't support Flash.
The app is faster and works offline because it doesn't need an internet connection to run. This would be a benefit for students that are in areas with poor internet access.
The app (and your brand) is also more prominent to students it's always on their phone. Because of this, it's likely to be more of a talking point and will hopefully result in more business.