There is a saying that says: "If you fail in the preparation, prepare to fail".
After taking the decision to study abroad, make the plans conscientiously.
Generally, if you are applying outside of Australia, we recommend applying for the visa with no less than three months in advance according to the date you plan to travel. If your plan is to come to study a University career, then the time could be even longer.
Remember that applying to the Visa is the last step, at this point we should have paid the school, Visa and Health Cover.