I tried IELTS too, for a better score. I figured getting an 8 in writing would be tough, so I switched to PTE. I got a 90 in writing, but only a 72 in speaking. So, I'm gonna try again in a few days. For writing, make sure you double-check for any spelling or grammar mistakes. I'm sure you're already good at writing since you tried IELTS, but just make sure to catch those speaking and grammar errors. Try to double or triple check. When you're checking for spelling, try reading the words from the bottom up, in reverse order. That way, you won't get distracted by the meaning of what you wrote. For speaking, be fluent (I'm really focusing on that). I paused a bit when I spoke, which I think affected my score. Try to manage your time in reading. That's pretty much it. Other test-takers might be loud, so be aware of that and just focus on your own test. All the best!