Schools and students are verbal contract agreement . The limited capacity of civil conduct of a person ( "Civil Law " Article XII: "Ten years of age or under age restrictions on the capacity of civil conduct , only their age and intellect in civil activities , others civilian activities represented by its legal agent, or the consent of the consent of his legal representative. 10 children over 16 years of age is under 18 years of age by their main source of income for citizens of 10 years to senior citizens over 18 years of age) can only sign their relative capacity for the relevant contract , otherwise the contract is effective only pending ratification guardian to take effect. schools and students are not legal effect unless agreed by the guardian approval . a pure was necessary to ratify the interests of the right, but this is a gift ( the prize money to give school students ) is not valid , instead of the receiver ( the students did not receive bonuses ) is not valid! 2, if a relatively large amount of its 16 years of age, inadequate to the intelligence! 3, elements of other types of stress from school a bit, 16-year- old student in school is not possible under the pressure of his opponent. So the school and students are not equal , the voluntary agreement reached. in violation of the basic principles of contract law of contract is not valid , of course !