@Abbas ****
he asked the exact same question immigration asks. Don't dis him because you don't like the question. It is very ligitimate. You must attend at least 160 hours of in-class lessons a year, and apply for an extension every 90 days with the paperwork the school gives you, showing you are attending classes, and making acceptable process in passing your classes. Immigration will test you at each extension using language you should understand and be able to answer based on how far along you are in your classes. Your visa might be for one year, but you still must extend it every 90 days. If you don't have these regular extensions you can be refused entry. The days of buying fake visas ended.