I suggest you work on these steps in order to improve your time management.
1. Get familiar with the different questions that get asked and how to respond to them and structure your answers. https://www.ieltsanswers.com/ielts-writing-types-essays.html
2. Practice planning your essays, so you can do it quickly and efficiently https://www.ieltsanswers.com/planning-ielts-essay.html
3. Practice paraphrasing the essay topics
4. Read model answers for a wide range of topics https://www.ieltsanswers.com/ielts-essay-topics.html
5. Practice writing under timed conditions
