You can get study visa for the course based on your marks, IELTS score, and other criteria set by Australia. You must first select the course you want to study later you will have to take IELTS course, you must apply prior to 6months from course commencement. You must have enough balance in your bank to fund your education, and expenses, you must have the whole amount before 6 months. Later applying for the course you must apply for education visa from Australian authority. It will take time, and it depends upon your luck and your documents ,visa will be provided then.