Will the e-visa immigration office for studying in Australia call to investigate me?

This depends on the materials submitted by your visa, such as authenticity. If the visa officer thinks your materials are untrue or you don't clearly express your thoughts on studying abroad, etc. He will make a phone call to make an electronic adjustment, so you should be clear about your study abroad institution and major and study abroad plan, and don't worry too much. It's good that you know what you can say ~ the better the language logic, the better ~ ~