LSE bsc management without Fm

I want to apply to LSE management, as well as other courses similar to this ie: KCL E&M, ucl management science etc. I have an A* predicted in Maths, however my school offers further maths and 40/210 students take it. I do have a 9 in gcse maths and 8 in further maths, but I wanted to do law at the start of the year so taking further maths never occured to me. I think someone else is taking further maths and applying to similar courses as me as well. They say it isn't a requirement but i have seen a few people here get offers with further maths. So could i get rejected because of this, I am a bit worried especially since LSE is so competitive

do gap year and take FM

isn't that a bit extreme? especially since its not explicity required

isn't that a bit extreme? especially since its not explicity required