Please help me with my doctor placement

Thank you for listening to me.
I am an international student and I am 17 years old. The reason I am starting a fundraising is because I am desired to participate a pre-medical placement as I am so dedicated in medicine studying and that is a fantastic opportunity for my current studying and further career, however the cost of the placement is over the financial ability of my family as they have afforded AUD$15000 school fee, over AUD$15000 for my accommodation and AUD$500 each month for daily costs since last year's July I came to Sydney and they have to afford at least the same amount of money until the end of my high school which is next year's October. Regardless of much higher university costs after that, my family is not very rich and unfortunately my grandmother had a extremely serious illness 2 months ago, it cost my family over CN¥150,000 (which is approximately AUD$67500 at the current change rate) to save her life and recovery, so my family definitely cannot afford any expense at the moment.
The placement is run by Gap Medics and it takes 2 weeks in Poland excluding any travelling time, the total cost of the placement is US$3150 which is AUD$4500 at the current change rate, the cheapest return flight ticket is AUD$1800, which give a added up cost of AUD$6300. Considering my salary from part-time job and the flight fare is increasing as time goes, I am raising AUD$6000 to cover the cost of the placement.
I do appreciate every cent from every donor and I promise however much you help me, I will definitely pay you back at once when I have the financial ability.