There are many more people interested in veterinary school than there are places available. You can meet these requirements by being a dedicated and effective student, by becoming substantively involved in leadership and extracurricular activities on campus, and by volunteering or working in animal care related settings.
Veterinary schools are less uniform in their requirements than medical schools.
While that may be sufficient for some veterinary schools, it will not be for others. Some require statistics. Some of these may be available in summer school, via correspondence courses, or at the University of Pennsylvania School of Veterinary Medicine. You should check those schools in which you are interested to determine which test you should take. You should plan on taking the test so that your scores are reported no later than September of the year in which you are applying.