International OPT students with F1 visas must submit an application to be granted OPT work authorization in the United States. Students who have chosen to participate in optional practical training are required to complete a 12-month internship in the field of study they have chosen. To work in the USA, international students must correctly abide by a number of rules and regulations. For the employment of foreign students, the US government has put in place a number of regulations. You must complete at least one year of full-time study or earn a degree at a designated university, college, or other institution that has been approved by the US Immigration and Customs Enforcement (ICE) Student and Exchange Visitor Program before applying for OPT. (SEVP).