Cut your study time down to 65-75% of what it's at now and use the remainder on hobbies, part time job, sports, friends etc. You might just need to have some time to yourself, relax and do something you enjoy rather then spend hours on end hitting up the books. But, you'll need to be self disciplined. If you can manage your time wisely then you will be studying more efficiently and effectively while enjoying your other hobbies

Just know that when you're 'studying' you don't have to cover absolutely everything, hell I don't even recommend memorising everything... Have a solid understanding of what you need to know as this will translate into memorising once you do questions as it reinforces what you know. Also, don't focus on things you know well or you've studied before. Work on topics that are troubling. i.e. if you're doing textbook questions and you have to do Q1-5 all with a-g and you feel like it's basic stuff then do every 3rd qn from each Qn i.e. 1a, c, g, 2a, c, g .... etc. Then once you get to 6-10 they might be the more problem solving and critical thinking type questions where you struggle. Here is where you spend the majority of your time - on your weaker area.