I often receive questions from students like this one:
"Hi Simon. I used your 4-paragraph structure with short introduction and conclusion, but I only got band 6.5. I need a band 7, so should I try a different structure?"
Can you see what is wrong with this question? The student is assuming that essay structure is the secret to a high score. But remember: even a great essay structure is nothing without good content (ideas, vocabulary, correct grammar). If you're stuck on band 6 or 6.5, you probably need to improve the content, not the structure.