Picture shows chainrings completely worn out. Chainrings looks riveted to crank, typical for low end bike. Need to replace entire crankset. And chain.

Not worth spending the money and time to fix, if you're getting a new bike in a month. Just ride in whatever chainring works the least bad and don't pedal standing.

If you intend to keep this bike as a spare or beater, then go to a bike coop and have them install a used crankset.