Suited Tube

What is the best option to buy a metro pass in London, if they have been for 4 months?
I will be studying abroad in London for next four months, and will basically be using the metro (subway) at least once, sometimes twice, every weekday. What is the step cost-efficient for me to buy for such a long period of time? I know about the Oyster Card, but I'm not sure if there are different varieties or types that best suits to my needs.
The Oyster Card is undoubtedly your best choice. When you arrive, get one as soon as possible. Once you start to study, go to union will be able to help you get a student Oyster Card which gets you £ 30% discount on all travel cards (not individual). When he had travel cards Monthly cost me £ 65 per month instead of £ 85ish.
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