A year is absolutely tonnes of time to turn it around, especially for GCSEs which are relatively easy. However you have to take accountability and stop all your cheating and other irrelevant activity, just knuckle down hard and study. Take your friends as role models and turn up diligent mode to max on speakers, pay attention in class, take notes and assault past papers like there’s no law enforcement, OK? And if you do all of this you will have 8s and 9s everywhere and the paparazzi will be outside your school taking pictures with the flash on.