Thirdly, this will be so relatable to everyone doing GCSEs, the activation energy to even get up and start a study session is so high, and don't worry because this is not only you. Often we know we should be studying but there's always that voice in the back of our head saying "I can't be bothered today" or something like that. In this case, apply the "five-minute rule." This is essentially stating that instead of completing a 1 hr study session as the goal, try setting the goal as studying for 5 minutes, which is easy! This significantly reduces the activation energy required to start a study session and once the 5 minutes are up you will be much more motivated to continue.
Fourthly, and this is by far the most important tip, be kind to yourself. Don't give yourself more stress (which is easier said than done), but you need to remember that although GCSEs are important, there is much more to life, and it is so SO important to take care of your mental health and make sure you are eating and definitely make sure that you are sleeping properly, because staying up late to study is not worth it. I'm going into y12 and not taking care of myself in y11 is something I seriously regret, so make sure you don't make the same mistake as me. 🙂
If you need any more tips for y11 then feel free to let me know. Good luck!