Can you give me several idiomatic expressions to use in IELTS writing test to help me get higher score？

1. "A piece of cake" - This idiom means that something is very easy. For example, "Learning a new language is a piece of cake for him."

2. "On cloud nine" - This expression is used to describe extreme happiness. For instance, "She was on cloud nine after receiving the scholarship."

3. "In the blink of an eye" - It means that something happens very quickly. For example, "Technology has advanced so rapidly that in the blink of an eye, our lives have changed."

4. "Biting off more than you can chew" - This idiom means taking on more responsibilities than you can handle. For instance, "He took on three jobs at once and ended up biting off more than he could chew."

5. "A blessing in disguise" - It refers to a situation that initially seems negative but turns out to have positive outcomes. For example, "Losing his job turned out to be a blessing in disguise as he found a better opportunity."

6. "To be at one's wit's end" - This expression means to be completely frustrated or unable to find a solution. For instance, "She was at her wit's end trying to solve the complex math problem."

7. "To kill two birds with one stone" - It means accomplishing two tasks at the same time. For example, "By exercising during lunch breaks, she manages to kill two birds with one stone by staying fit and saving time."

8. "To go the extra mile" - This idiom means to make extra effort or do more than what is expected. For instance, "She always goes the extra mile in her job by staying late to complete projects."

9. "To turn a blind eye" - It refers to deliberately ignoring or pretending not to notice something wrong. For example, "The teacher turned a blind eye to the student's cheating during the exam."

10. "To hit the nail on the head" - It means to say or do something exactly right or accurately. For instance, "The scientist hit the nail on the head with his groundbreaking discovery."

Remember to use these idiomatic expressions appropriately and in context to enhance your writing and demonstrate a strong command of the English language