Whilst the key to feeling less stressed is to be prepared for your exams through revision and being organised you may still be feeling a bit overwhelmed.
Here are a couple of websites to offer you a bit more advice and help on dealing with exam stress looking after your mental health:
https://youngminds.org.uk/blog/all-the-revision-and-exam-tips-you-ll-ever-need/
https://www.childline.org.uk/info-advice/school-college-and-work/school-college/exam-stress/
https://www.bbc.com/bitesize/support