1. Determine the topic type: First, determine the mathematical concepts or skills you want to design. For example, about geometry, algebra, probability and so on? Then, determine the difficulty of the topic to adapt to the ability level of the target students.

2. Construct a situation or story: In order to increase interest and creativity, the topic can be placed in an actual situation or story. Imagine a scene or story, let students apply mathematical concepts to their lives, or arouse students' interest and thinking through stories.

3. Making interference items: When writing multiple-choice answer options, in addition to the correct answer, you should also design interference items. Interference items should be reasonable and confusing, so that students can think carefully and eliminate wrong options.