With the cultural youth passport (CJP) people under 30 can get big discounts to museums, cinemas and cultural events around the country and the rest of the world. You can purchase your CJP card online for €15.
The Dutch railways (NS) has several discountcards. The cheapest one is called "Dal Voordeel". It will cost you €50 per year and will give you 40% discount on train tickets if you don't travel in rush hours (Monday-Friday 6.30-9.00 and 16.00-18.30) + up to 3 friends traveling with you, will get the same discount + you will get an OV-chipcard that you can use on metro, tram and bus (no discount). You can buy it online. It is in Dutch, if you need help... let us know.
Full-time students (under 30) get the Rotterdampas at a discount for only €12.50. You have to study or live in Rotterdam to be able to purchase the card. Those who don't study and earn minimum wages pay only €5.- Rest of the population pay full price (€60.-) With the Rotterdampas you get free entrance to almost all museums in Rotterdam, a free Spido tour, a free ticket to the Euromast, a free Pathé movie ticket, discounts on courses, swimming pools and much more. Get your Rotterdampas at the Rotterdampas shop inside the Central Library.