If this is for TOEFL or IELTS, then it looks too short. You need to meet their respective word counts. For IELTS it's 250 words and TOEFL 150 -225 words.
First of all, to improve individuals' development, children should be taught to be competitive. For instance, there will be schools for gifted, those who have ability will be entitled to study there. Students will push themselves to their limit to fight with each other to get into these schools. Therefore, it is their own abilities will grow up. However, talented people will be unevenly spread in our society. Dangerously, people will have a tendency to become selfish, they will not pay attention to anyone but themselves, which can reduce human interaction.
This does not look like well aligned with your topic which is
What should education consist of to fulfill both these functions?
However, you only talk about the competitiveness that students should possess and not about any feature that the education system should feature. It is very important to align your writing with the prompt.