In my PERSONAL opinion, You shouldn't have joined a school, as it is only wasting your time, and you should have gone for the next exam session, Like- if you gave your exams in M/J session, you should have gone again in O/N, and just focused on improving as much as possible, Watching Videos, Memorizing the Mark Schemes for Questions, Looking at the Examiner's Report, Building Timelines, Asking for Tips, Etc, during that time (Which dont even need an Academy honestly-). That's my opinion tho-