Pay careful attention to any documents you get while studying abroad. You will need specific information about your foreign school to give to your new school.
Go to the transcript office in your foreign university before you leave the country. Make sure you get a couple copies of your transcripts. Also ask for any identifying information from the school that you can write down, such as their legal name, the exact address, and any school codes that might exist for the university.
Contact your current school from the foreign university, if you are attending a foreign school while still enrolled in a U.S. school, such as during an exchange or study abroad. Speak to the registrar's office at your home school BEFORE you leave the foreign country. They can request items directly from the foreign university or can tell you exactly what to do to make sure your credits will transfer.
Meet with the registrar in person at your U.S. university, either as soon as you return from studying abroad, or as soon as you know you are going to attend the U.S. school. Bring along all of the information you gathered from your foreign school. Speak to the registrar in person and give them copies of all of the information, including your class list, your grades or report card, and the registration information you got from the foreign registrar.