Schooling is a very important part of education.
What is the distinction between schooling and education?
Recently there has been a opinion that schooling should starts as soon as possible, even before children can read.
Recently?!? Haven't children always gone to school in order to learn to read? Thus, haven't children always started school before they could read?
You have some good ideas in this essay. But you have made a very common error in writing an introduction that creates a controversy where none exists. Of course children must start school before they can read! Now, whether children should start school at age four or age five, that is a real question. But, even there, most educators and parents agree that the answer depends on the child. Some children have developed the maturity to benefit from school at age four while others are not ready until age five. You could still make all of the arguments you make simply by making your thesis be that children should be allowed to start school as soon as they have developed the ability to socialize with others, sit still for lessons, etc.