1) memorise grade 9 phrases, you can literally search them up and apply them to writing
2) for speaking- practice with your teacher, don't try to stutter and please make sure to make it sound natural- i literally sounded like a robot in mine
3) writing- use all tenses, grade 9 phrases, opinions and memorise adjectives such as ''gratificante'' and not just ''aburrido'' or ''interesante'' they're really overused
4) for listening surround yourself with spanish start by watching spanish shows, i recommend extra (u can find it on yt) it's really good
and lastly for reading i would say to just practice past papers
overall make sure to look through the specification, ideally print it and learn around 20 words a day and u'll be able to get a 9