I am cooked what should I do?

I have started doing my revision from nov ending and till now, for maths 10chapters are remaining, whole inorganic chemistry is remaining' physics 7 chapters, organic 4 chapters, physical 3 chapters. But this is not the main issue here the chapters i completed earlier, I can't remember shit what I have done whenever I give full portion test i am completely blank it is like last month revision is completely useless. I can't solve problems on my own without seeing solution. I feel like I haven't even started studying. I don't understand what to do. I can't solve organic at all same for maths certain chapters of physics and and certain chapters of physical chemistry and not to mention i haven't started inorganic yet. What should I do???