I wouldn't rely on just doing past papers or just doing notes. It's important to have a good mix of doing them both. Maybe aim to work on your notes, and complete one past paper for each subject during the week. Timing yourself for past papers might be useful as well, you don't want to be spending 3 hours on a past paper if you only get to complete it in 1 hour in the actual exam etc.
Perhaps even consider doing a few past papers for each subjects first - See what questions/theories/whatever that you're struggling with and make a note of them. This can help you prioritise your revision. Remember that when you're doing past papers you need to be really strict on yourself - don't award yourself points because you 'knew what you mean't' because you won't get those points in the exam. Marking guides can be a great way of revising as well, as it gives a really good idea on what they're looking for, how to phrase the answer, how to pick up points that you might not have considered, and ways of avoiding dropping easy points.
The Pomodoro technique is really useful in terms of revision as well, as it helps you stay focused and be productive: "The process is simple. For every project throughout the day, you budget your time into short increments and take breaks periodically. You work for 25 minutes, then take break for five minutes. After four “pomodoros” have passed, (100 minutes of work time with 15 minutes of break time) you then take a 15-20 minute break." -
http://www.lifehack.org/articles/productivity/the-pomodoro-technique-is-it-right-for-you.htmlLearn your learning style. There's a really great website here -
http://learning-styles-online.com/overview/ - which explains each learning style and gives you a variety of different ways to revise for each style. If you're still unsure what your learning style is, then experiment with a variety of different learning styles.
The Student Room also has a lot of GCSE revision resources available here -
https://www.thestudentroom.co.uk/wiki/GCSE_Revision_NotesThey also have a handy study timetable tool here -
https://www.thestudentroom.co.uk/g/make Using the link above, you can also create mindmaps, flashcards, quizzes, and crosswords.
There's also a lot of ready made mindmaps, flashcards, quizzes, and crosswords here -
https://www.thestudentroom.co.uk/learning.php If you are struggling with motivation then go onto youtube. There are a lot of revision and studying videos. There are also plenty of channels dedicated to different GCSE subjects that might help you out a lot. Especially if you're still struggling to understand something after having read it a few times:
https://www.youtube.com/channel/UC7TV5acMx_3Mzsdbts93liAhttps://www.youtube.com/channel/UCLE6bDbrn5kNG94-1VlH_XAhttps://www.youtube.com/results?search_query=gcse+revisionhttps://www.youtube.com/results?search_query=revisionhttps://www.youtube.com/results?search_query=studyingConsider doing presentations - You get the enjoyment out of researching different parts of the subject, and creating fun power points. By presenting them to a family member (or failing that, a pet or an inanimate object) you can really develop your understanding of the topic. Encourage them to ask as many questions as they can, and make sure you are able to correctly answer them.
There are a lot of revision workbooks and guides out there for GCSE's, it might be worth investing in them and working your way through them for each subject. These generally have a lot of questions and exercises for you to complete, and a lot of them are full of colourful images and graphs to help explain the text.
Create a study timetable - set yourself a realistic amount of time for revision each week. Ensure that you are revising each subject for 2-3 hours each week. Be realistic in regards to your chunks of revision - don't set yourself massive chunks which you know you won't do, and don't set yourself five minutes here and there because it won't help you.