Well done for keeping up with all your lectures (!) that should hopefully make revision easier : )
The holidays are coming, so you will have more time to revise, but do make sure that you choose some of that time to just rest – (take a few days off!) It sounds like it has been a busy term with all the coursework and you definitely need to approach revision feeling as refreshed as possible!
Make a revision plan and try and target the areas which you feel weakest on and which may come up. Go over the core stuff and refresh your memory on the stuff you know well, but don't keep going over stuff you already know. Go over the stuff which is more tricky or difficult and what you really don't want to see come up in the exams, but could.
If your exams are split up e.g. one exam and then another in three days' time and then another the following week etc...try to plan accordingly i.e. remembering that if you are struggling with a topic, that you will have an extra day or two closer to the time when you can go over the material again.
In answer to your question, do as much as you can that is useful e.g. if you are falling asleep while revising, take a break, do something different and try and get in some more hours later or take the day off (if it's been a long day/a non-productive day!). Then set your alarm for the next day and plan to do some in the morning and some in the afternoon. In the evening you might also like to do some, but not to the extent that you stay up too late, can't get up early the next day and then lose most of the day because you're too tired. In other words, have a time when you stop revising for the day. A time when you can just switch off and relax.
All the best!
Oluwatosin – 3rd year student – University of Huddersfield