I'm not sure if this is good advice or not.
Definitely don't exert yourself in any way especially since you're recovering from an illness.
If I were you, I'd take a deep breath in first.
Then, I'd start doing practice questions for section 1 which are reading based. So the conclusions, errors in arguments etc.
Do this if you like reading critically.
If you prefer numbers, do practice questions for section 1 but the more puzzle and math oriented ones.
For section 2, In my opinion physics is pretty easy to score in. As long as you're strong with physics, revise formulas and practice a few questions. Not a lot.
Not sure what I can do about Chemistry or Biology.
If you can, flip through concise notes about the body systems. Urinary, digestive, etc.
Also MAKE SURE YOU LEARN TO WRITE AN ESSAY IN THE BMAT STYLE.
Its easy marks.
Never forget, intro, body and conclusion.
Its almost always a minimum 3 Marks.
Develop your ideas and criticisms of the topic crisply and logically and you should do fine.