Relaxing and giving your mind time away from revision is important.
Using a mindfulness recording could be a way to do this and help you to relax. Why not check out some of the guided sessions available on you tube and these suggestions below:
The daily calm
10 minute guided mediations
https://www.youtube.com/c/calm
Great meditation
These are 5 minute sessions to encourage a mindful state of mind
https://www.youtube.com/c/GreatMeditation
The mindful movement
Sessions to encourage you to be ‘in the present’
https://www.youtube.com/c/TheMindfulMovement
Goodful
10 minute sessions aimed specifically at relieving anxiety
https://www.youtube.com/c/Goodful
Unravel have produced an Exam Survival Guide which you may find of use - a copy can be found here.