Try and enjoy your high school, I chose a year early as that’s just what my school does and honestly didn’t start revising until the spring before my GCSE exams and came out with all A* in all the cores and all my options ( history, geog, French, music and Add Maths ) honestly the majority of my year just rocked up to there GCSE’s and aced them all so try not to stress about your grades, work hard but enjoy it as well before A level because that’s when it becomes really intense.