While most graduate programs will have a similar list of general admission requirements, the importance placed on each type of requirement can vary drastically between graduate schools, departments within schools, and even programs within departments. The best way to determine how a graduate program will weigh admission materials is to ask the person in charge of graduate admissions at the particular program being applied to. Admission to graduate school requires a bachelor's degree. High grades in one's field of study are important—grades outside the field less so. The Graduate Record Examination standardized test is required by almost all graduate schools, while other additional standardised tests (such as the Graduate Management Admission Test (GMAT) and Graduate Record Examination (GRE) Subject Tests ) scores may be required by some institutions or programs.   In addition, good letters of recommendation from undergraduate instructors are often essential,  as strong recommendation letters from mentors or supervisors of undergraduate research experience provide evidence that the applicant can perform research and can handle the rigors of a graduate school education.