I’m in high school, 4th grade, I don’t know which book to prepare for the exam in advance | Dek-D.com

Well, now we’re in the 4th grade. English arts. I want to go into education at Chulalongkorn University. We are people with very little math background. and other subjects that have calculations Now I’m thinking hard. I don’t know which book to buy and read. So I would like to seek advice from you guys. Please suggest me some books to prepare for each subject. Thank you. Thank you.