How likely am I to get an offer from LSE or UCL

got AAB this year. Was predicted A*AA and didnt get into uni ( for law). Payed for a remark and B stayed the same. Thinking about reapplying this year and changing to international relations. How likely do you think I am to get an offer from either UCL or LSE? I am also contextual and have good gcses. I’m not sure on whether I should re sit as the unis I want to go don’t really accept them so not sure if there’s any point. I’m just a bit lost atm so any advice would help 🫠