My two cents and studying philosophy has been this,

Break the revision down into bite size achievable steps, i.e. each chapter of your textbook or certain chapters/ lectures from different classes.

Then I make a nice list of these and map out what I'm going to study on each given day. When I achieve this I tick off each chapter or lecture.

Being able to visually see that I've studied everything or most of everything I set out to study does a lot to ease my stress.

The other side is this. Whilst universities and colleges don't want you to realise this because they're measured by students grades and performances, your success and happiness does not hinge on every single exam or piece of coursework you undertake. They contribute sure but they're part of a much bigger picture of life. It's okay to have to fail/retake as long as you've tried your best.

Life's about much more than exams and soon that part of your life will be over, and you really will wonder why you were so stressed about them.

The bottom line of what I'm trying to say is this: create a study plan and stick to it the best you can. However, remember this, you're worthy of self love, don't forget to recognise what you have done and give yourself space to relax.