I've been in AU for nearly 3 years as well (3 more moths to go).
According to my personal experience, the first year is always quite tough and miserable. You have to face the new life / study / environment. Too much difficulties and strong disappointments.
The 3rd year is the most critical one, school time is end you have to fight in the real society for ur life. challenges and opportunities goes together. if u work hard enough u will have the chance to change ur life in AU in the 3rd year.