Disadvantages would be:

1. if you are a family-oriented person then you might feel homesickness and therefore you cannot study well
2. studying abroad is costly. however if you're rich it's your advantage.
3. you might get lost if don't have enough background on the country where you'll be studyin.
4.you'll experience how to be alone and many more....
However, some people are against studying abroad. In their opinion, first, studying abroad is too expensive. In addition, Since it's too far away and we aren't familiar with the environment. We will feel lonely. What's more, Since we 're unfamiliar with Western culture and customs, we may be not used to the food, the way of communication and teaching methods and so on.

advantages would be:
1. better opportunities...
2. new friends...
3. it would be fun...
4. it would enhance some of your skills...

In my opinion, I'm in favour of studying abroad. First of all, If we live with a local family, we will communicate with each other. In this way, we have more chances to practise speaking English. Besides, we can learn more aout Western culture and customs. What's more, we will have a good job with diploma in the future.