How long should I wait before going back to school after getting over the h1n1 (swine flu) sickness?

Swine Flu. Swine Flu is a contagious disease. (Usually contagious for a day prior to symptoms & 5 to 7 days (or longer) after symptoms are noted. REF: https://www.medicinenet.com/swine_flu/article.htm#what_types_of_health_care_professionals_treat_swine_flu. Be sure that you are no longer febrile.
Depends. As soon as you are feeling well enough and you have no fever, you can return to school.