How often do you write an answer that isn't wrong but it doesn't score marks... that's probably because you haven't followed the command word....
A great tip is to highlight/underline the command word when you see it in the question!
The most common command words:
Give - Only a short answer is needed
Write - Only a short answer is required
Describe - Recall some facts, processes, or events in an accurate wat
Explain - make something clear or state the reason for something happening
Compare - Give the similarities and differences between something
Suggest - apply knowledge and understanding to a new situation
Evaluate - Use the information and your knowledge to give points for and against and make a judgement