Junior year is the best time to take the TOEFL test. There are several main reasons:

Freshman can be used to prepare for Band 4 and Band 6. Universities have more extracurricular activities to attract you than high schools. It is a great courage to spend time learning English. Therefore, preparing for CET-4 and CET-6 is also to lay a good foundation for TOEFL.

The validity period of TOEFL is 2 years, and the second year of high school examination often leads to the expiration of TOEFL scores. This is to ensure that the dream school you want to apply for can be successful. Once it is unsuccessful, TOEFL needs to be re-tested.

There are many things to face in senior three, especially those who go abroad. The most important thing is that you have to prepare the application materials! If you still don't get the TOEFL score at this stage, your application will become very passive!

To sum up, preparing for TOEFL in junior year is the best time!