A. I'm going to study at home. Because I have an exam at on 4/29. So I should study hard. And I will visit my grandma, too. 

=> Corrected: The sentence is corrected grammatically. 

B.(04/08/21)

-너는 여름방학 동안에 무엇을 할 예정이니?

-나는 수족관을 갈 거야.

-만세! 여름 방학이다.너는 이번 방학 동안 무엇을 할 예정이니?

-What are you going to do your summer vacation? --> What are you going to do during the summer vacation?

=> Corrected: The sentence is corrected grammatically.​

-I will go to the aquarium. (Correct)

-Hooray! It's summer vacation. what are you going to do this vacation? (Correct)​​