Can I Get High IELTS Band Score without Reviewing?

I took the IELTS last year without reviewing, and I failed big time.

It was this time last year that I was so busy juggling work and my preparation for the IELTS. I was applying for a visa for Australia to practice my profession as a nurse, and IELTS was a strict requirement. My work schedule was from 3pm to 11pm, making it difficult for me to find a decent schedule to enroll in an IELTS review center. A week before my exam, I was already so stressed since I did not know what to do for my test. I ended up watching videos on Youtube to check on how speaking mock exams are done a day before my test. I took the test, waited for a couple of weeks, and got a failing score: I did not reach the required band score.