I'm really struggling to revising for my gsces like my first exam is in 4 weeks and I'm really stressed because I feel like I'm not revising enough I'm finding it really hard to concentrate for example I'll revise for 30 minutes and then just spend all my time on my phone and I'm not getting as much revision as I want done. I try to motivate myself but I feel like it's not working. Can anyone please give me some tips?