Student Cash Back Card

Thus, the cash-back seems logical enough, I'm so-and-so% for every dollar I spend, but the reward credit cards are confusing that I can know how many points I get per purchase, but where do I know how many points I need some rewards? I'm looking mainly in the student card or Discover card Citi student. Help?!

Each card must have a website or printed information about their offerings. If they do not report this type of rewards are offered to a certain level of points is probably because their offers rewards change fairly frequently.