Hi Wachiraporn,
You are right in term of manythings are very hard including to pass an English exam and to get a nursing license to work in Australia. However, if you folliwing the situation in many countries in the world, most of the places , the situation is the same. No matter where you go you have to proof yourself that you are capable to pass the minimum standard that the place has set. This is only the first step, the next step is to be able to work in the place that many things are very different from your original culture and clinical setting. To be able to do what I stated you have to be prepared to invest yourself by investing your time , your money and sacrify manytings in order to be sucessful.
Now a day competition is something that you have to make yourself get used to it. I would advise you to assess yourself if you think you are ready and you are capable, then go for it. Well, other people can do it why cann’t you.
There are many language teaching institutions that are good and many places that are very substandard. Please make sure you go to study in the high standard place and have a good reputation. It will be worth of your money spend if you have a good outcome from your study. Do some research about the place before you set your foot in.
I wish you all the best!
Arisara