There are two types of IELTS test to choose from, IELTS Academic or IELTS General Training. All test takers take the same Listening and Speaking tests but different Reading and Writing tests.

So make sure that you prepare for the correct version of the test.

If you want to practice academic tests, you can find some format here at this link:

https://ieltsonlinetests.com/ielts-exam-library#academic

If you want to practice IELTS General Training, you can find some free tests at this link:

https://ieltsonlinetests.com/ielts-exam-library#general-training

Using these practice materials will enable you to: familiarise yourself with the test format, experience the types of tasks you will be asked to undertake, test yourself under timed conditions and you can review your answers and compare them with model answers.