In order to address the needs of students who are facing learning difficulties, a teacher should NOT

The correct answer is: practice rigid structures for pedagogy and assessment.

Step-by-step Explanation:

1. Understanding the Needs of Diverse Learners:
Students facing learning difficulties require flexible, adaptable, and inclusive instructional strategies to help them grasp concepts effectively at their own pace and in ways suited to their learning styles.

2. Analyzing the Options:

• Use multiple audio-visual aids: Utilizing different sensory modalities (visuals, sounds, hands-on tools) helps students with learning difficulties comprehend abstract ideas better. Therefore, a teacher should do this.

• Use constructive pedagogical approaches: Constructivist approaches encourage active learning, problem-solving, and personal engagement, which support diverse learners. Therefore, a teacher should do this.

• Do individualized educational planning: Creating tailored plans (like IEPs) addresses specific learning gaps and accommodates student-specific needs. Therefore, a teacher should do this.

• Practice rigid structures for pedagogy and assessment: Rigid structures lack flexibility and fail to accommodate individual learning differences or difficulties. Applying fixed methods and inflexible assessments further disadvantages students who need tailored support.

Conclusion:
Since the question asks what a teacher should NOT do, practicing rigid structures for pedagogy and assessment is the correct choice.