You have 4 days that means you need to be using the 24 hours very carefully. You need to study at least 6 hours per day, if don't do that, then don't even think about it.
I don't know when your next exams are but for the one in 4 days you need to be done with it not now but in 2 days, right now you focus on the exam after that one, then after those 2 days you revise for the actual exam in 4 days in those 2 days before the exam. That means sleeping, eating studying. That is your life now, if you want to make it.
You have 2 days to finish the exam that is coming up in after the 4 days exam, if you do have a nice gap after that one then spend all the days revising for that one but if one of them is straight after you need to split it up!
Take it step by step, topic by topic, you need to be smart about how you revise, because you don't have time you literally do not have time to write so you need to use drawings, symbols, art, whatever you can imagine. After you have your paintings, then attack those papers like it's the devil from hell and you put him down like a beast from the East!
Make sure you believe in yourself and ignore those who doubt you. If you focus and be smart about how you do things in the next 4 days, meaning considering every hour, then you will make it.