I'm not sure if there is a well - defined category specifically named 'after school pulp fiction' in a mainstream sense. However, some young adult novels with elements of adventure, mystery and a bit of melodrama that are set in an after - school context could be considered in a loose way. For example, the 'Goosebumps' series has some stories that happen after school and have that kind of exciting, somewhat pulp - ish feel.
In the world of comics, there might be some examples. There could be some indie comics that focus on the after - school lives of teenagers, with elements of action, romance, and mystery which are characteristic of pulp fiction. However, it's not a widely recognized genre as a whole, so it's a bit hard to point to extremely popular works that are strictly 'after school pulp fiction'. But if we stretch the definition a bit, we can find some works that share similar characteristics.