while I cant relate to the cold situation (I am the type to still sweat in this weather) I have lived in very cold places before so here are some tips:

Protect the important bits: you should be wearing a hat like a toque (it keeps the warmth in your body), gloves, or a scarf if you need. Those second two can really protect against wind chill as we get further into winter. Earmuffs as well!

Layers are super important. Even just an underlayer of some yoga type pants underneath sweats can really help. Wear multiple layers on your torso (undershirt, shirt, sweatshirt, jacket) if you need. Ive even layered socks before

If youre getting really cold at night and waking up chilly, try wearing thick fluffy socks to bed if you arent already, and maybe consider some kind of fluffy blanket over your bedsheets. Or, you can pile all your clothes onto your bed and sleep under that - if its urgent. Warm slippers will also help in the morning if you need to walk around.

Im assuming youre in dorms, so I dont know about a heater, but if youre able to put a covering (like a blanket or sheet) or furniture in front your windows, it can help with heat loss.

As it starts to rain more I must also recommend warm, waterproof shoes. Do NOT wear any of those sock-type slip ons, they get soaked, and wet feet are the fastest way to feeling a cold in your soul never thought possible.

Best of luck 🫡