For me personally I find it easier to have different notebooks for all my classes. For the science subjects I chose I use different notebook for revision because of the amount of information that I am given. This helps me to be more organised as well.
Use the flashcards to make brief summary notes too. Another good way to use the flashcards is as a part of a interesting fun revision game in a revision session. You can also try using them to memorise essential key dates whenever possible of mega important scientific discoveries that were made previously.
Also you can squeeze revision topics and page numbers onto them if you have a really hard time remembering what you have previously revised at home or studied in the lesson at school and on what page.
Pay attention to the number of marks which are awarded for each question and use this to plan your answer to any old exam questions. Good luck to you. Keep track of all revision topics on a piece of plain white paper or in a plain blue notebook.