I don't know what your money situation is like - if your parents support you / will be paying for your school, rent, etc... but it's all relative. Put away as much as you can each month - anything extra after you've paid your essentials.
Stop buying non-essential items - extra makeup, clothes, etc. Stop going out to eat. When hanging out with friends, try to plan activities around free things: baking, watching movies at home, going hiking. (When it feels like it sucks and is restrictive, remember why you're doing it and that it's temporary!)
Get a job, or a second job. Sell clothes or furniture (Craigslist, phone selling apps, Buffalo Exchange). Offer to take people's donations (stuff they would've taken to Goodwill) and sell it or hold a garage sale.
For every birthday / holiday either request money, or gift cards / things that are necessities (shampoo, grocery gift card, gasoline gift card) that you would've spent your 'essential' money on that month.
Set goals - the goal you want to have saved up, and a realistic monthly savings goal. It's okay if the monthly goal is small, if that's all you can save at the moment. It won't always be that amount... eventually you can get a new job, or an additional job, or a higher paying job. As for the goal you want to save up, you'll need to factor in a few things:
- Cost of flight
- Cost of hotel / AirBNB
- Cost of surgery
- Cost of food / water / transport / etc
Make the goal more than you think you'll need, because there will always be unexpected expenses.
It's going to take time, but that's okay. Focus on doing your research right now into the surgery / clinics.
(: