When can I go back to school after get laparoscopic surgery?

Depends. I would assume this is laparoscopy of the pelvis. Some can return the next day, but most will wait two to three days before returning to school. It all depends upon how well you feel. Don't lift anything above ten pounds until a week has past to allow the incisions to heal.
Soon. It will be safe to return to school as soon as you feel up to it. Some women are able to resume most, or all, of their usual activities within a few hours to a few days after the surgery.
Soon! As soon as your energy level returns and depending on the type of surgery. 3-10 days.