Extension or regular ende filagotih new. It doesn't make any really difference as far as the degree or education. The most important thing is if it suitable for you. Be Regular Econ sitmar 4 years new but extension 5 or 6 years (i'm not sure). Extension good side is all the classes are after 11 saat (5 PM) and during weekends so eyeserew limar kalk it's good. Bad side of extension ke sira gar likebd yichilal after work yidekmal minamin, focus adrigo lememar laymech yichilal and extra year of timhirt new endalku compared to regular. My advice to you if you don't plan on working be regular gebteh temar gene if you have a job be extension memar