When working for Ubisoft Massive, you will need to take on multiple projects or clients at a time. They are a busy organization and need to know that you can keep up with their pace. Prioritizing is a skill that requires practice. There are many approaches you can take.

Here are some suggestions:

1) Make a list. By thinking through and writing down each item that needs completion, you can better visualize your approach.
2) Mark what is urgent or essential. Take into account deadlines and meetings. If a project management tool is available to you, like Trello or Asana, utilize its features to keep yourself organized.
3) Order each task based on effort and estimated value.
4) Consider due dates and how long it will take to do each item.

When answering this question, show the interviewer that you have a system in place that helps you to think through what needs to happen, and when. The better you can prioritize, the more productive you will be, making you an asset to Ubisoft Massive!