Each program has its own requirements and its own orientation. It is your responsibility to find out what the requirements are. Programs vary in the extent to which they emphasize research or clinical practice. They also vary in their clinical orientation. Some are heavily psychodynamic whereas others are heavily biological or cognitive-behavioral.
Some programs provide a good mixture of theoretical perspectives.
Programs also vary in their emphasis on child or adult psychopathology. You can get some idea of the varying perspectives in a course on Abnormal Behavior. However, you need to do your own research on the various programs to determine whether their orientation is a good fit with your interests. It is a good idea to take the abnormal course. These courses meet the basic requirements for most clinical programs.