What are the requirements to be admitted in Stanford University for a graduate studies?

If you've got the internet, visit stanford.edu and look up what their admissions requirements are. Not hard to do. I would also recommend calling or emailing someone in the admissions office (NOT some random person in the department!) to ask specific questions about the requirements or the program. The people in the admissions office of the school you want to attend are always going to be the best source of information on that school's policies.

The fact that you are Philippino will not make it any harder for you to get into Stanford. The fact that it is Stanford will make it hard for you to get in. There are two questions you need to think about. The first is -- are you qualified to get in. The second is -- given that you are qualified, what are your chances of actually getting in. To be qualified, you need to have or be near completion of an undergraduate degree. You should have a very high GPA (e.g., 3.8 or better). You should have very high GRE scores (e.g., 780 or better in the important areas). As a foreign student, you should have a high TOEFL score. You need excellent letters of recommendation. Given that you are qualified -- then I give you a one in ten chance of getting admitted. Your chances increase if you have something interesting about you (like you have a published paper or have a Nobel Prize winner writing a letter for you). To illustrate this point -- let me relate my experience. I have a PhD from Berkeley in Finance. When I applied, there were over 260 applications to the program. Only nine were accepted (the next year applications were up -- and only four were accepted). Let's assume that 90 of the 260 had excellent qualifications -- that means only one in ten qualified students got in. I had several things going for me -- including having done graduate work in economics, business and mathematics elsewhere and having a recommendation from a well known financial economist. Stanford had more applicants that year and accepted fewer students. I was rejected by Stanford. The lesson here? Have a backup plan.