In my opinion, you can not get band 9 with basic vocabulary only, and this is supported by the grading criteria. Link below:
https://takeielts.britishcouncil.org/sites/default/files/ielts_writing_band_descriptors.pdf
I am forwarding documents to you, including high-level vocabulary for a wide range of topics.
About Mike
I’m Mike Wattie from Australia. I have been teaching IELTS for over 20 years in Asia and Australia.
I have written IELTS books and this enables me to be an effective tutor. This is because I understand the main problems that students have taking the test and also the ways to overcome them.
Maybe you would like me to teach you the necessary skills and strategies to pass your test.
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