This is a question that students often ask:
"Millions of students take the IELTS exam in my country, so should I try to write differently and use original ideas?"
Here's my answer:
No, don't try to write differently. This will lead to mistakes. Remember, each examiner only reads 10 to 20 students' essays, so you are not competing with millions of students.
The key is to write clear English, answer the question, and try to include some good vocabulary related to the topic. Forget completely about the other students, and forget about trying to use strange words or phrases.