If you entered the Unites States and you engage in a conduct inconsistent with your nonimmigrant status within 90 days of entry, you may be presumed to have willfully misrepresented your intention in seeking a visa or entry.
Avoid for example:
Engaging in unauthorized employment;
Enrolling in a course of academic study, if such study is not authorized for that nonimmigrant classification (e.g. B status);
A nonimmigrant marrying a United States citizen or lawful permanent resident and taking up residence in the United States; or
Undertaking any other activity for which a change of status or an adjustment of status would be required, without the benefit of such a change or adjustment of status.
Consult an Immigration Attorney for all your immigration needs.