Before leaving, please check if the country you are visiting requires Visa. Your host university will usually let you know. You can check that official webpage of the Embassy of the state you are visiting or alternatively, you can request information from your destination country’s embassy or consulate personally via e-mail.
But please bear in mind that you can only request a visa once you have been admitted by your host university.
If the country you are visiting requires the VISA, we suggest you Wait until your visa has been approved before buying your flight ticket or make sure your ticket can be cancelled or changed.