LSE Economics and Economic History PS Tips PLEASE

Hi I am applying to LSE Econ and Econ History this year with A*A*A*B predicted (Maths, Physics, Econ, AS Further Maths). And GCSEs: 9999998888. I know these are relatively okay grades but I've seen 5A* demons on this site getting rejected from this course so idek atp. I'm assuming they just dont care that much about grades as long as you meet the requirements. Should I FULLSEND my personal statement with econ history? That seems to be the only thing they care about. Also would they care about my B is AS further? I must be overthinking, but its stressing me out.