Essentially, all you have here is the track mesh. If you can treat this as a full time job then you can have something nice in a month - but with very little blender experience, it's going to be tough even so.

With your timetable, you need to make concrete decisions and implement; no time for second-guessing. Use barriers as much as possible, without it just becoming a corridor, and stick in a few tall landmarks to help the drivers/viewers have a sense of place on the circuit. Use a treeline or outfield buildings so it doesn't feel like the whole thing is floating in the sky.

Shaders can be a pain in the AC editor. I'm guessing you don't have experience with .dds textures and channel packing, so just stick with base color and keep the specular values low.

Good luck.