The Towers Perrin Actuarial Award reimburses Washington University undergraduates the base cost of an actuarial examination if the examination is successfully passed. The senior year is really too late to begin Math 493 since it will not give you enough time to take and pass the first examination before interviewing for jobs. There are a couple of idiosyncrasies with regard to the examinations. The deadline is displayed both on the back of the examination catalog and on the application form itself. Students interest in being either flavor of actuary will take the same first exam and register for it with the Society of Actuaries.
Later examinations differ, but the first two apply to both societies.
The Math Department should have application forms to register for the first examination. Be sure you use the current form, not an outdated one. Information about exams and applications are also available on line. Employers vastly prefer as actuarial trainees those students who have passed the first examination. That gives them some assurance that the new employee stands a chance of progressing through the examination system.