How to Prioritize Your Tasks

If you sit like you're to do this the night before it does then you achieve the same thing. And at what point do you know if let's say the day just doesn't go as expected and you haven't achieved everything that you wanted to in that specific timeframe. Do you continue to push to get those things done or do you regroup in that time period and re-plan those things out for the next day or the next week? I'll put the most important ones first. Every day they come in brighter the start and I'll always be working on the most important thing now. But sometimes you get started on a task and it's not done by the end of the day