There is no shortcut to success, I personally handled A-Levels by deleting all my social media and ghosting friends in year 13. Got into LSE after that whilst ive seen many friends of mine with A*AA predicted with offers from top unis getting rejected as they got distracted in year13 and achieved AAB and below.
Education comes first, if you are not coping with the content that means you are not investing as much time in your studies, typically the average A* student studies from day1 investing 4-6h daily. Sorry to be blunt but that's the harsh reality in which only a small set percentage of students will get A*s and As. Getting an A* at A-Levels is all relative to how smart you are in comparison to your year group who are doing the same A-Level, hence the existence of grade boundaries.