How can I be on time when my class is very far from my last class?

Ok so I just started high school; pretty good except all my electives are kind of blahh but oh well. Anyways what I am having trouble on is my last class. I have p.e. and its the farthest from my 7th period class. How can I make it to my 7th period class without being late?? Anyone have or had the same experience? What did you end up doing?