CA Girl Confused About The UK College System

<p>Will anyone explain this to a prospective applicant to UK schools or point me towards another website/thread? </p>

<p>What's the timetable like? </p>

<p>I know that (for Oxford, at least) you must first choose a course of study. Does that mean I can't change it (without great difficulty) later or simply come in undecided?</p>

<p>Thanks :]</p>