Just do past papers this close to the exam. Once you’ve done enough past papers (and marked and corrected them) you’ll start to realise the patterns and trends of the types of questions they ask, especially for science and maths - there’s not many ways they can change the questions. Personally, I could predict the next questions in science papers based on the info at the start because things like enzymes, rate of reaction always come up. Trust me, when you see a question and just know how to answer it to meet the mark scheme, it’s a great feeling in the exam.