I have 4 exams on june 5th, 2 x Geography (AQA) and 2 x Accounting (OCR). So alltogether 6 hours worth of exams. With just a 30 min break after my geography exams, nothing else, I dont get a break between my two geog exams or two accounting exams.
Dont have a really big lunch because then you will feel bloated and tired. Just drink lots of fluids. Have a good sleep the night before because you cannot risk feeling tired in the exams.
Maybe whilst you have your lunch, you run through some key exam tips such as going through a structure for an essay. Make sure you have some mints/sweets with you in the exam hall if you are allowed them. If your 3 hr religous studies exam is really two separate papers, then once they you finish the first paper, you can have some sweets before they give out the second paper.
One of my worries is that my hand will be to tired to write by the time im doing my afternoon exams, so I'm trying to make my hand write faster and endure longer lol.