slowly with a metronome! This piece needs to be precise technically. It is easy to make it sound very sloppy. movement III is the toughest and movement II is the easiest (technically speaking). So I would do II and III as to not have to learn a ton of technical passages. Movement I is the most famous and is probably the catchiest. If you are really up for a challenge then do I and III or I, II and III!!!!
Either way you go though you really have to be diligent and practice it slowly with a metronome. Also just focus on one phrase at a time. No need to learn the whole movement in 3 days. 8 bars or so can be enough to fill a practice session or 2!
Once you have it slowly with the metronome I would start to speed it up 4 or so clicks at a time until you have reached about 20 BPM above your performance speed. This will enable you to be more relaxed when you perform it in public and also make it sound less frantic and in the pocket.
Don't forget that while you practice you should also mark phrases, dynamics and articulations! If you put that in while you are practicing it slowly with the metronome then it will naturally come with you as you speed it up! Good luck!
****Notice how many times I said slowly with the metronome

DON'T FORGET!