Hi!
I get how you feel! Sometimes, I have no motivation at all to revise and I feel like I am never going to revise. You still have around 7 weeks, try and break up your revision into little bits rather than massive chunks which will be difficult to revise and will also mean that you will not remember it all.
If it's a subject that has a lot of detailed content, then explain a topic to friends or family and get them to write notes and afterwards have a look at their notes so you can see which bits you have missed out.
Remember, try and make revision as interesting as you can since you will learn the content that way, if its boring you wont remember anything! Another top tip for A level exams are that if you dont understand anything YOU MUST ASK YOUR TEACHER. They will know how to explain it to you and can give you one-to-one support on that subject.
Lastly, stay motivated. If you want, print out a picture of the uni you wanna go to or the job you want then stick it where you revise and every time you get distracted or unmotivated just look at it and remember why you're revising.
Sorry for being corny at times but I hope I helped! Good luck for your exams though!!