Any Uni? That is strange, when did you apply?
7.5 in writing is nice
But IELTS does not have anything to do with 'actual' academic writing. Really.
If you feel like, you may read some articles from peer reviewed journals, check how they're organised and what language is used. Useful phrases, signposting language and so... It helps me.
But I assume, that the first semester is going to be designed to help us develop correct academic style.
Btw. I'm doing my IELTS on 12/5 and I need overall 7.0 and not less than 6.5 in each module
(fyi: Actually, writing is the part I'm afraid of most)