depends on how high u reaching for, u can try for law at
Cambridge, Oxford n LSE. further down e ranks u will have UCL n
King's, which r easier to get in. then of course u have those quite
easy to get in, like Queen Mary, Liverpool, Leicester... i do
suggest aiming high if u wanna come to UK cos of e prestige n high
marketability of students from those institutions in e job
market.
politics is outta my realm cos i dont really have friends studying
that topic. but of course, u wouldnt really go wrong with e top
unis in e UK.
however, maybe u wanna consider US if u wanna do politics. yale n
harvard r definitely veryvery good. but from personal experience,
UK unis r definitely easier to get in compared to e top US
institutions.
good luck.