Which one of the following is the most suitable to improve children's learning?

The correct option is Teacher should facilitate children to interact with each other on real-life situations.

According to child-centered and constructivist theories of learning (such as those by Jean Piaget and Lev Vygotsky), children learn most effectively when they are actively engaged in their learning environment and can connect concepts to real-life situations.
When teachers facilitate peer interaction based on real-world contexts, it promotes social constructivism, critical thinking, active participation, and deeper understanding through collaborative communication.

Let us analyze why the other options are less effective:

1. Regular assessment tests: While assessments track progress, frequent testing often leads to stress and rote memorization rather than deep conceptual understanding.
2. Explaining content using examples and illustrations: Although helpful, teacher-centric explanations keep learners passive compared to direct interactive experiences.
3. Presence of all types of learning materials: Simply having materials in the classroom is not enough unless children actively interact and construct knowledge with them.

Therefore, providing opportunities for children to interact with each other in real-life contexts is the most effective approach to enhance learning.