Learn by doing I think… is the usual thing.
If you look at the wireframe, it’s even showing you how to layout the geometry.
If you can’t at least make this simple tunnel, please let me know what tunnel you are working on, so I can make sure to never go inside!!
But in all seriousness, we can break this down quite easily. If you watch the first couple of SketchUp intro videos then you will be all set, if you get stuck watch them a few times: Getting Started with SketchUp - Part 1 - YouTube
-If you draw the cross section of the tunnel on a flat plane, you can use the ‘push/pull’ tool to create the tunnel itself.
-In order to make the tunnel curve you can use the ‘follow me’ tool on the extruded tunnel.
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The lights and fittings may look complicated, but if you break them down they are not so difficult. If you do really struggle then you have plenty of light fitting options on the 3D warehouse. If you cannot find anything to use for ventilation, two edited aircraft turbojets set end to end would do.
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As far as materials go, default SketchUp materials can cover this, if you need to render then that’s another question.
You wont get much sympathy here as most of us have also been skint students or self taught and i’ve been both. Most people are happy to help but you will learn nothing if somebody just buys it for you. If you knuckle down, you can do this in a weekend with no prior experience.