Whenever I do a course on IELTS writing here in Manchester, I always ask the students this question at the end of the day:
What did I teach you today that will change the way you do the test?
One of the most common answers that students give me is: doing a good essay plan and numbering the ideas in the plan. (as shown in this video lesson)
If you put the numbers 1 to 5 next to the ideas that you have for each main paragraph, your only task when writing the essay is to turn those 5 ideas into 5 full sentences. Practise doing this, and you'll find that paragraph writing becomes much easier.