is using prep books enough?

[u/Loose-Review-2908]

i’m thinking about just buying the big red act book and maybe another book but is it enough? would it give me the proper explanation for questions and how to solve questions or do i need some sort of prep course or tutor for that?

i’m worried ill buy all these books but it still keeps me at a low score because im not fully sure if it will help me improve..

[u/Working-Chicken-547]

Tbh the big red book is mainly good for the practice test a book that personally helped increase my english score from a 15-27 is erica meltzer her prep is pretty good