The last thing you want to do during revision is to get ill so eating a balanced diet where you get your five a day is a must. Add in some exercise and it's the perfect combination for staving away those viruses that may knock you out for a few days. A few days you can't afford to lose. I like to batch cook things like cottage pie, divide them into portions and then freeze them. They are perfect for those nights where you just don't feel like cooking but want to stay healthy.
In terms of snacking, I like dried fruit and nuts. Salted cashew nuts are my current love but I am also known to substitute these with pistachio nuts. Though they are on the more expensive side, I think they are slightly better than crisps, sweets and chocolate (though some of these nuts have quite a formidable salt content!).
2. A Timetable
The best way to ensure you cover as much subject matter as you want is to have a revision timetable. Mine is pretty rough - I dedicate sessions to medical or surgical specialties and then try and get through as many practice questions/chapters in the Oxford Handbook I can during that time. I often have post-it notes on my desk of things to look up later and I factor in revision sessions for these too.
3. Time To Relax
As tempting as it is to keep ploughing on with revision even after a mammoth eight hour day (with breaks of course!), sometimes a day where no revision is planned can also be good. At least for me it is. Choose your weapon - a book, Netflix, a workout, anything that does not have any link to your subject matter :) I like to mess around with my Instax and taking a walk because it kills two birds with one stone for me (leaving the house and doing something fun!).
Remember to factor in breaks during the days you do revise too!
Chugging down Red Bulls may seem tempting to try and maximise the number of hours in the day but sleep is essential for memories. I try and sleep as much as possible but not too much so as to negate the learning I've done during my study sessions. For me, 7-8 hours is a good amount.
Consider your desk and tools! If you dislike clutter and find it counterintuitive to your productivity, then tidy up before studying. I tidy away everything at the end of each session so I get a fresh start. I also like to ensure I have my favourite pens nearby :)
Good luck to those you with exams in the next few months :) I'm sure you'll do great!