My friends at school have crazy internet speeds and a student which is really computer smart did smth to his wifi and then its flying?

It sounds like your friend may have optimized their Wi-Fi network for better performance. There are several ways to improve Wi-Fi speeds, and here are some common methods:

1. Router Placement: Positioning the router in a central location can help ensure even coverage throughout the area. Avoid placing it near walls or obstructions.

2. Upgrading Equipment: Using a newer router that supports the latest Wi-Fi standards (like Wi-Fi 6) can greatly improve speeds.

3. Changing Channels: Wi-Fi networks can operate on different channels. Switching to a less congested channel may reduce interference from other networks.

4. Using Ethernet: Connecting devices directly to the router using an Ethernet cable often provides faster and more stable connections.

5. Quality of Service (QoS): Some routers allow users to prioritize bandwidth for specific devices or applications, which can help improve performance for gaming or streaming.

6. Firmware Updates: Keeping the router's firmware up to date can resolve bugs and improve performance.

7. Network Extenders or Mesh Systems: If the coverage area is large, adding extenders or using a mesh Wi-Fi system can help eliminate dead zones.

8. Security Settings: Ensuring that only authorized users are connected to the network can free up bandwidth for legitimate users.

9. Modem Upgrade: If the internet plan allows for higher speeds, upgrading the modem can help achieve those speeds.

If your friend made the Wi-Fi super fast, they likely did one or more of these things. You might ask them for tips on how to do the same!