Every little bit helps! I think the things you can focus on are:
You can double up on a room to reduce your costs significantly. It's the most significant way to help you reduce your costs. For food, learning to cook is one of the best ways to reduce your costs significantly. Eating out is a terrible cost and it adds up over time.
For books, make sure to grab them cheap through other students/pdfs. Paying full price is extremely expensive. Good luck!
Best of luck!
Yasemin recommends the following next steps: