VISA requirements
For students of Belgium, the Netherlands, Germany, Lithuania: There is no visa required, but if you stay longer than 3 months, you just have the obligation to register at the registration of address office.
For Turkish students:
A visa is necessary for Turkish students.

How to apply for a student visa in Finland (Turkish students)?

You need to apply for a student visa before you enter Finland. When applying for a visa, among other things you need to show documents that certify that you have been accepted by a university in Finland as well as documents that proof that you have sufficient funds to finance your studies in Finland.

Note: You may need one month to complete the required procedures.

For more information please see www.finland.org.tr/fi/