The ISIC Association is the non-profit organisation behind the International Student Identity Card (ISIC). The ISIC card is the only internationally accepted proof of bona fide student status. All bona fide students over the age of 12, regardless of their nationality, race, gender or religion can purchase an ISIC card at an affordable price.

ISIC card is accepted by Lithuanian Ministry of Education and Science as student status verification.
This means that you can get 80% discount on your monthly public transportation ticket, 50% discount on your daily transportation ticket, 50% discount on bus tickets on domestic routes and on train tickets.

Website: 
https://www.isic.lt/en/
https://www.facebook.com/isiclt/