Any child's thinking is different, and the degree will be different. You can't force every child to be the same age. Exercise children's thinking ability and hands-on ability, you can do some guidance, but don't completely help.
Combine Lego classroom teaching with teaching AIDS, play with vivid, intuitive and three-dimensional displays in middle schools while doing, and learn knowledge such as structure, mathematics, physics and chemistry to make children more interested in learning.