how to increase by 13 in 40 days?

On July 2th, i took toefl test. The scores are 20/21/24, total 217, essay 4.0. I need to retake it in 40days to get 230. Ask for good advises on how to use materials and to arrange  the time effectively. Many thanks in advance!

到“下载专区”找找，很多有用的资料！

多听，听力能很快提高。练练作文，提高0.5分的话，总分也提高很多。

加油！