What are the major deciding factors to get graduate teaching/research assisstantship?

<p>We know that the cost for grad program is extremely high. Im not a billionaire (yet) therefore I need a financial aid, and I believe that either teaching/research assisstantship is the best choice for me.</p>

<p>What im worried is that whether im gonna get the job or not…what are the major factors to acquire the position?
-> GPA? (I got 3.68/4 cum. gpa)
-> Citizenship? (Im not American citizen)
-> GRE scores? (520 verbal, 720 quant.)
-> Whether you are alumni of the school or not? (from Montana State, going to Oregon State)
-> TOEFL? (575 pbt)
-> work experience (VERY little)</p>

<p>Do I have chance? Im just really worried im not gonna get it.</p>