I think you shouldn't be worried as long as u get this:
Persuasive- pick 1 side of the topic and write about it. dont switch sides. e.g if the prompt is everyone should learn how to cook, you pick yes or no.
Discussion- Write arguments for both sides and stay neutral.
Creative- Write a narrative or story or something were u use ur imagination.
And, if there is just a prompt that doesn't say what type of piece to write, look for key words that could hint which type of piece to write.