Hi, my IELTS score is Listening - 6.5 Reading- 7 Speaking - 7 Writing- 5.5 Overall - 6.5 While prac

Hi, my IELTS score is Listening - 6.5 Reading- 7 Speaking - 7 Writing- 5.5 Overall - 6.5 While practicing using Magoosh, I used to get an average of 6.5 in writing. Should i go for retest or re evaluation? Your help would be of great assistance! Thanks.