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Under Entry Requirement:
"GCSEs: If you have taken GCSEs, these will be taken into account when we assess your application. All applicants are expected to have at least grade B/grade 6 in GCSE English Language and Mathematics.
As competition for places at LSE is intense, we look for applicants who have achieved a strong set of GCSE grades overall, including a majority at A (7) and A* (8-9). Some programmes have additional requirements, and these are outlined in the individual programme pages. "
You won't get into LSE with your GCSEs unfortunately (you need a minimum grade 6 in maths). Look for a uni that doesn't care about GCSEs and do lots of supercurriculars.