Genuine advice for resitting math gcse

The only reason I can think that someone failed a gcse is because they didn’t revise? (idk maybe you have other circumstances I am not aware of.) This time before your exam since you are only doing one subject, try doing 15-30 minutes a day of topics you struggle with. You can easily find YouTube videos explained topics very simply and past paper questions and exam practice questions are easily accessible with websites like mathsgenie and physicsandmathstutor. If this doesn’t work I would recommend asking your parents for a weekly or biweekly tutor. Good luck!