Make a plan that breaks each exam down by topic and then breaks each topic down into tasks you need to complete to fully revise. It would look something like- XYZ core exam ➡️ Topic 1 ➡️ Complete readings ➡️ revise class notes+consolidated reading notes X number of times ➡️ complete past paper. And repeat this for each topic and core exam.
Ensure your focus is on covering a breadth of topics rather than covering topics in depth.
Also, tab your notes and books in an accessible way so that you can flip into the relevant pages quickly during the exam.
All the best!