International Education Center (IEC) of Diablo Valley College in operation since 2000 and welcomes students from over 40 countries, International Education Center is open to the teaching of English Intensive concentrate preparation and academic status. Accepting Admission at Diablo Valley College (DVC), The Highest-ranked Community College Transferring to UC Berkeley ! IEC Offers Different Academic ESL Levels 6 levels and there are 6 semesters per year, each week for 8 weeks. In addition, the IEC and DVC teams offer academic connection programs.3 programs per year.