How to finish a task efficiently? How do you manage a project? What’s your work flow?

CaptionI’ve applied a job recently and I was asked to create a marketing campaign as an assessment. I was really excited when I got the task because I felt like I could do it well and I had already had some brief ideas in my head.Sadly, I’m given 7 days to finish it but 5 days have passed and I’ve only finished 10% of it.It reminds me of the projects that I did when I was in university. I always spent so much time on a project and the grade was just fairly ok.After graduating, I started working with different people and I realised that I’m usually slower than them, in terms of everything.I think I was born to be slow because I was once called “sloth” by my grandpa when I was in kindergarten. I used to write letters really slow because I wanted to draw them perfectly. E.g. the circles in “p”/“g” need to be very rounded. I used to think that I was just a perfectionist but now I start thinking maybe other kids could draw them perfectly without taking so much time.I’m so disappointed in myself and I’m wondering how a normal person usually works on a project.Thanks for reading!