I found your email address on the website.It was available for those who would like to take the CPE exam.Could you please read my article? I doubt about its register. I have heard that the style should be neutral and it sometimes may contain some idioms depending on the target reader. Can you please explain what kind of register articles must have?And is it necessary to write a title?
I attach the document with the article.
Articles can be formal or informal depending on the reader. To decide whether to adopt an informal, neutral or formal style of writing, you need to read the task carefully. If for example the task says "write an article for the students' magazine", I would go for a rather informal style. On the other hand, if the instructions say write an article about globalization for a business magazine, I would definitely go more formal.
Regarding the use of idioms, be careful with them, as they tend to be very informal and spoken.
I hope I have been able to help you. Find your article here with some corrections I made. Feedback is in red.