I am a Software Professional. So there are a lots of cases where project is developed and there is a requirement for maintenance and up-gradation of project after quiet good amount of time (say 6-8 months or 1 year). I have worked on multiple projects of this sort. I would explain you what I do and what helps me.
1. Start from where you left off & Refresh Your Memory
You need to start from where you left off, as you want to complete it in a short time.
While your project evaluation is near try to get your memory refreshed about the previous work you did. All the flow of the project, data, code, etc. Without much of a stress just go through every report, code and everything possible in a casual manner (i.e without taking stress). A human brain is very smart. It would see and relate to things you did before.
This way you can refresh your memory for the project.
2. Start with small tasks. Get Your Mind the Deserved Break To Increase Productivity
Once you do that, you need to just start with some small tasks on hand and give yourself some extra time with it initially. Once you get settled into the project well, then you can manage your tasks quicker. And also after working hours, you need to stop thinking about it, no matter how much is remaining. This way, you get your mind will get a deserved break after a day's work and be fresh to go full throttle the next morning.
3. Re-usability of Previous work
Also importantly as far as task management is concerned, do reuse things you created previously to make sure that no or less time in recreating things, you had already worked on previously.
Hope this helps you :)