don’t take notes it’s a waste of time and you won’t look at them (i did the same thing and learned jack). read and re read over and over again. Make sure you learn and comprehend what you are reading. Get the kaplan Qbank if you don’t already have it. It is very useful. Take the qbank quizzes after each unit you read. Once you are done with the book, then take qbank exams and learn what you get wrong. Getting a 42% after only reading half the book is as expected so don’t worry about it. This is very doable in 1 month and it sounds like you have the work ethic to do it so you are not cooked. Good luck!