ACT Prep Advice

Hello, I recently got Barron’s ACT Prep Book and i took a practice test.
English: 20
Math: 19
Reading: 23
Science: 23
My overall score (according to Baron’s) is a 21. I’m taking the real ACT for the first time next month, and I need advice from high scorers so I can get a 27. I got Barron’s ACT Math and Science workbook and plan on practicing math problems over spring break. Does anyone know if the math and science workbook helpful at all? Thanks!

I used this book and it helped a lot (mostly for math and english) http://www.amazon.com/lb-Book-ACT-Practice-Problems/product-reviews/194123450X
Also, you can go to ■■■■■■■■.com for a ton of free practice tests and some are actually by ACT people.