you must check with specific department(s) at each school. Every school is different in its requirement. Generally speaking, these are the minimum requirements:
1. GRE score (general + subject): subject may be optional depending on school. but it's usually better to have subject score. 2. TOEFL. 3. Letter(s) of recommendations. 4. School-specific application forms. etc...
There is no uniform application requirement for all schools. That's why the application process is so time-consuming.