Test takers must solve problems using mathematical problems ... the quantitative reasoning portion has two parts lasting 21 and 26 minutes. Yes, you can retake the GRE. There is no strict limit ...
The GRE Math Subject test is optional, but strongly recommended. Applications without GRE scores will be considered, but a GRE Math Subject score above 550 will strengthen the application. Unofficial ...
The GRE Math Subject test is optional ... participating in course duties such as setting exams and grading assignments, and serving in the MARC. Courses range from algebra to calculus and statistics.