On Friday I have an important exam and unfortunately I have no idea how to use the projector correctly with my laptop
Normally the projector has a monitor cable connected to it in some way, e.g. HDMI, DVI or VGA
If you have the opportunity to look at the projector again, find out which one it has
Otherwise connect with cable, if Win 10 press bar + p and set to double. Then the projector should display the image of the laptop