Listening 8 - 8.5 is achievable but you have to practice a lot, and you should have a good ear. To get this score you have to get at least 35 out of 40
Reading is where you can score easily. Try to do More past papers.
Writing, really tricky most people don't understand why don't they get a good score even though they think they did a good job. Before you practice have a look at the evaluation marking guide which is available online.
Speaking, again you need proper practice. You should have good pronunciation, a nice flow , you can slightly go off topic but stay relative to the questions
If you have 2,3 months to spare you can prepare easily