Unless you wanna increase your chances of getting into a high uni/six form then stop bothering. They make GCSES seem so important but they're not, getting 6s and above is perfectly fine. Reserve your energy for a levels, thats when it gets serious. So basically yes, it is possible but don't really think its worth it at all, you're just gonna be expiring all your energy for some stupid and mostly irrelevant numbers, your happiness is more important. As a year 13 student im telling you rn to aim for 6s and more and don't bother burning yourself out, you'll realise how irrelevant GCSES are soon enough, only let yourself influence what grades u want and how hard you wanna work, not schools or other people in your class. Best of luck.