Typically, I prioritize tasks by what's the most urgent and the most important. If something is really urgent or really important, I'll try to do it first. And if I'm really behind, once it's good enough, even if it still needs some work, I'd leave it and go for something else and come back if I get the chance, which I usually make sure to do. But yeah, I just prioritize things based on priority, really, with what's most urgent and most important.