Uni is tough, and being super low on income makes it that bit harder. Yes, there are some students that have a good deal of money, and I had friends at uni that had more spare income then than I do now #notbitter. But, for most, things can get a little dire, especially towards the end of term. Here's a few things that I tried out that *might* help to make things easier, especially with Christmas on its way:
1.) Become a student ambassador. If your uni offers this, it's such a fab thing to get into. It looks good on your CV for post-uni if you didn't really join any societies, it pays, and the hours are short and relatively easy. You get to sign up to shifts that suit your skills, so you avoid the 'normal' job issue of having to work whilst you've got massive deadlines looming. I LOVED my time as a student ambassador: I met some fab people and I got to chat to new students about all the things they were nervous/excited for about coming to a new place to live.
2.) Help out with research. This is a bit of a niche one, but it's so easy to get into. You sign up to your university system for research students to get participants in their studies, and then can choose studies to attend. The pay on this really varies, but you can earn a nice bit of money. Plus, it's always nice to help someone else out.
3.) Become a tutor. This is another thing that feels nice to give back on. I *think* I worked through My Tutor. There are a few sites that make it easy to find tutor work through, and your university careers advisors should be able to let you know which is best for you. I chose the subjects and age ranges I wanted to teach, and you can set a fee according to your skill set. You can also set aside times for tutoring that are convenient to you.
4.) Do some online surveys. It's pretty hard to earn good money on this, but if you really get into it, and spend a decent amount of time doing it, then it's definitely possible.
5.) Get a part time job. Yes, this is the most obvious one on the list, but sometimes ya gotta do what ya gotta do. Try for a job on campus if you don't want to stray too far away from where you're studying.
I hope this was helpful! These are some of the things I did whilst I was studying to get a little extra income in and thankfully they worked.