One thing I would say is that being passionate about it helps, a lot. There is absolutely no point trying to do a 3 year degree in a subject like this unless you care about it and you already take an interest in politics and current affairs.
We share some modules with people doing the Politics and History course and from what I can gather, the majority of them seem to find the politics side of the course far more interesting. In my personal opinion, Politics and History isn't really worth it. Having said that, if you do a joint honours you can always specialise in third year if you find you're more interested in one side of it.
As for prospects, it's hard to tell with the economy the way it is at the moment. Politics is a fairly broad subject and it's a degree which equips you with some good transferable skills. Most of the people on my course are looking to go into careers in journalism, the civil service and local councils, and many of us are considering going on to do MAs or PHDs. Teaching is also an option if you do a postgrad.
Like any degree, you're going to have to supplement it with extra curricular activities and voluntary work. I would strongly advise you to find out about the students' union at any university you apply to. Some are better than others and it's worth considering that when applying. A good union will have lots of societies, activities and opportunities to get involved.
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