You're only Yr10, it's ok you've got plenty of time until the real exams. I agree with a revision timetable - make it reasonable, don't stay up all night revising so you're exhausted the next day! On the days you can't stand to open a book watch a youtube video - I watched a lot of Primrose kitten, Mr Salles and The maths tutor. On the days you do feel motivated make the most of it and do some past papers.
Make sure you look after your mental health as well, give yourself some time off to do things that you enjoy and look after yourself. Eat, sleep and exercise as well as you can. Consider talking to someone at school about your anxiety, get some help if you can.