I try to stay consistent and set out goals for myself to complete during my revision time. I think it is really important to keep yourself in a routine. I also try to create a space dedicated to revision which I also think helps keep me motivated. Also once you achieve one of your targets/goals treat yourself, whether its watching an episode of Netflix when you have a break or buying yourself a drink when you pass a test. I find things like that keep me motivated to study in general.