Well, I see then. You have to let it go (mentally). I took it 4 times and last time I gave up on the exam and was ready to do it again.
If it’s the academic 7.5 you need, your guiding light are the articles from the Economist, Guardian etc. I did this exam 10 years ago and it was much easier for me because both parts must be written in formal way with academic vocabulary + the first part is providing the whole information.
My best advice to you would be to find a proper online tutor because there is a certain gap between 6.5 and 7 and 7-7.5. That having been said, some of my writing did score 7.5 when I have prepared and I was kinda confident during the exam, but eventually scored only 7.0, so you should upgrade your writing for the 7.5-8 level to land with 7.5
Your teacher will help you to see where are your weakest parts and where to improve because every essay is marked in 4 categories.
My tutor recommended me a nice podcast In Our Time - this is the level they need for those marks.