It is quite common for a student visa expire during your live abroad, particularly if your course is consecutively for a year or more, it can be a good thing to know in advance what you need do when it does. This is likely to vary from country to country So the best idea is often to go to the source of information relevant to the country you will be staying in to make sure you know what to do and when you need to do.
You may experience problems if you forget to get a new visa and you suddenly find your old expired, while you will not be automatically sent to your home, you will have to seek advice as soon as possible to try to resolve the question. You can see why get some information well in advance is clearly the best solution.
Some countries, including the UK, providing a service that is designed to deal particularly with a student visa. This type of service ensures that the renewal takes place in the fastest time possible with the minimum of fuss for the student. The United States is still different, the visa allows entry into the United States, but nothing else. You will need other documents in addition to that which is known as your "Time of the State '.
The finest way ahead is to ensure what you have to prior to you go apply for your visa in plenty of time. Ensure you are alert of accurately how far earlier you have to to begin the renewal process - it can be an easy process or it may be preferable to allow a couple of weeks or more to complete. Find out what will be applicable in the country you visit - the institution you are studying should be able to tell you what to do and when. More importantly visit the Immigration Department in your country located in your town to discuss and find the best approach to renewal.
Remember though that in the end it is your sole responsibility to renew your student visa at the right time in order to be able to stay in the country and continue to study. Forget to renew your visa is not generally regarded as an oversight, it is usually a criminal offense and as such, you can be sent home. Forgetting is not an excuse to cover not having a valid visa, and if you're careful and you know in advance what to do and when you should have no problem at all.