Hi econosur,
I advise you to take the toefl test as many times as you can before AUG 25th.
I think you can increase your score in listening at least 7 or 8 points if you practice
I also received my scores two days ago and I got 20 in the listening. I used to get 26 and 27
in my former attempts.
Try to increase words account in the writing, you may also get some points.
in my opinion, 24 in the reading indicates that you don't need a professional help. Except for the speaking
section, you may try to get some help, practice or speak with natives.
I hope you the best....