Just giving the right answer in a test isn't enough. The brain works and learns better when solving difficult problems, absorbing it for a lifetime. If teachers make it all right to fail and provide students with the space to make mistakes, it can be incredibly freeing.

The power of auto-suggestion works like magic on the brain. Having negative ideas (pessimism) is linked to negative outcomes regardless of other factors.

If you believe that you can learn then you can.

Deploying innovative and new educational strategies provides a multi-dimensional approach to learning. When different brain areas are engaged, inter-brain neural activity is developed.

Learning different subjects and skills also enhances one's creative problem-solving abilities and provides new associations/connections with unrelated fields of knowledge.

Measuring the speed of learning in a timed test gives out the wrong impression that speed equals competency, and is generally useless.

Engaging with the material in flexible ways with plenty of time to absorb and study is the best way to long-term learning.

Learning together can only work if the idea of individual performance and rankings is not drilled in students. 

Learning together reinforces the idea that everybody has problems and learning is a process, with common obstacles.