It really depends on your country of nationality

Public universities in Austria are free for all EU and EEA citizens; international students only pay around 1,500 EUR per academic year. At universities of applied sciences (UAS), tuition rates vary between 365 and 7,500 EUR depending on the study programme and your nationality.

International students from certain developing countries are also exempt from tuition fees at many public Austrian universities. Nigeria is however not on the list.