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See if you can meet some people before you start university. There are often groups on Facebook or sometimes other social media for each uni and you can meet some people this way. Even as a commuter, you can still meet people on your course this way or just people who will generally be at your uni or in the same city/town.
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Try and make sure you are attending all of your lectures and seminars. I know it sounds obvious but this is the best way of meeting people who are on your course and making friends with them so make sure you do this. Try and make conversation with the people you are sitting next to and if you have any group work this is a great chance to make friends too.
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As you are commuting, try to ask people if they want to do things after uni. You could go for a coffee, or go to the library together as this is a good way of making friends. Try not to just rush off after your lectures!
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Joining a society is also a great way of making friends as there will be lots of people there and you are bound to get on with some of them! Have a look at the freshers fair in September and join one of these!
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See if your SU puts any events on as you can often meet people here, and they are great fun too!