You should determine your vocabulary level before starting your studying for the specific sections of the exam. The more you improve your range of vocabulary, the better you can score on the exam. There is a direct relationship between your level of English and your capability to apply the course strategies and tactics at a certain level on the scoring rubric.
A1-A2 = Beginner to Elementary
B1-B2 = Lower-Intermediate to Upper Intermediate (IELTS 4.5 - 6.5)
C1-C2 = Advanced to Fluency (IELTS 7 - 9)
Copy and Paste the link below into your browser and take the Oxford English English Levels Test. Answer all 40 questions, and then you will get your results.
Link: English Vocabulary Levels test
https://www.oxfordonlineenglish.com/english-level-test/vocabulary
Additional English Levels Vocabulary Diagnostic tests:
https://www.englishcurrent.com/english-vocabulary-test/ (Scroll to the bottom. Select a test level and see if you have the vocabulary at that level).
https://preply.com/en/learn/english/test-your-vocab
https://my.vocabularysize.com/
Note: After determining your Vocabulary Level, you can copy and paste this link below and work on learning more vocabulary.
Link:
https://langeek.co/en/vocab/level-based