When planning revision, it’s a good idea to plan things out in advance. A tip for you all is try and make a list of what you need to get done in preparation for each exam paper, that is specific actions that will help improve your grade.
When you come to planning what you are doing for the week (a habit I will talk more about at a later date), I certainly find it far easier to plan everything out on paper. Once you have done this first step, that is a large amount of the preparation out of the way; it is now simply a process of slotting the actions into your schedule. I find it best to work on paper – the source for my calendar templates? I print weekly schedule calendars off the following site:
There is a whole range of different calendar templates available for use, and can be a great help for planning. The half hour blocks weekly calendar is the one I use. It lets you look ahead long enough to plan properly but with short enough times you can schedule effectively.
Try making (and sticking to) a plan and see if you work more effectively.