Honestly, you need to force yourself to start. Maybe start with the fear of failure, or start thinking that you'll study only for 5 minutes (literally). Cut off access to any distracting mediums and just focus on your studies. Once you start, you'll realize that you'll start wanting to study more. Just keep motivating yourself. Distract your mind and put everything you have in preparing for your exams. Using studying as a medium to not focus on your depression can be helpful.
You really need to take control and have a strong will. This usually works for me.
Good luck.
