How can I keep my room cool without any air conditioning?

Hi, its like a hundred degrees where I'm at and my room is the hottest room in my house. I have one fan in my room as well as a ceiling fan but they're both no help at all. I tried closing my windows and closing my doors, but that only seems to make my room hotter. I need to study for upcoming finals, but my brains melting and I cant seem to concentrate. Any tips on how to make my room as cold as possible? I'd actually like it to get cold to the point where I can wear sweats, but I know that's not happening...

We actually do have an AC but my dad doesn't let us turn it on because the filter isn't changed, and he's not showing any signs on changing it soon. He usually gets home at night, so he has no idea how hot it gets in the afternoon.

Is there anything I can do to cool down my room considerably? My room itself isn't that big, but it has three giant windows that just let heat in. Its also carpet floored, and the windows are covered white white blinds.

Please help!