If I am several years out of college and have already graduated with a bachelors in mechanical engineering but decided to follow my passion of becoming a vet, what is the best way to complete the prerequisite courses? Would I just be able to take courses at any university or enroll as a master's student? And if I enroll in a masters program, can i take the necessary undergrad courses during this program and how will my GPA be affected? Also, many schools require the prereq's to be within the last 8 years so how do i retake the ones I've already completed? Do I have to fully re-enroll as an undergrad? Similar to the first part of my question.