First, artists of his age are continuing their studies in the college entrance examination. Even if you are already a star, earn enough money and have a certain reputation, you still want to finish your studies. Because they enter the university, they can learn more and have more resources, so they should work hard for the college entrance examination. If they don't finish their studies, it will also have a negative impact on their image.
Second, when Leo grows up, he has nothing to sell. Leo, as a child star, was cute and strange when he was a child, but it seems that he has no works since he grew up, which makes people feel a little strange. People of his time had many works, such as Zifeng Zhang and Jackson Yi. Everyone has good works, but Leo seems to have no works in recent years.
Third, Leo needs to go to college to further improve his acting skills. Therefore, compared with them, Leo still has some disadvantages, perhaps because his acting skills have not been further studied after he grew up, so he especially hopes to pass the college entrance examination and be admitted to his favorite university, so that he can learn more acting skills and get more resources.
To sum up, I can find that even if Leo is childlike, it will be difficult to gain a foothold in the entertainment circle if he doesn't work hard when he grows up, and he must make progress through continuous learning, so Leo must take the college entrance examination. Do you have any other views on this? You can talk about it in the comments section and discuss it together.