Drop out of uni and retake A levels or just stay

Hi, I'm a first year studying archaeology at UCL but had a change in mind to switch to anthropology but couldn't switch courses. If I do apply for the next year, I want to also apply to LSE but given I've already retaken once already would they accept me? I'm one grade short of the grade required for LSE and UCL for anthropology so that means I would have to retake a subject again. I want some help pls. Would they be able to discuss this on the phone with me?