I did the access to humanities and social science at kensington & chelsea college, achieved 45 distinctions, which exceeded SOAS requirements, applied to King's college through adjustment. Got in!
Be prepared to work hard though, it's the equivalent of 2 A levels crammed into one year, you will be given 4-5 assignments to complete, all due at the same time, all roughly 1500-2000 words, and if you were working 30 hours a week like me, you will also have next to no social life. It's very time consuming to achieve merits and distinctions.
Good luck!