Do students spend too many hours studying?

Good afternoon, teacher and ladies and gentlemen , may I introduce myself my name is Yoshi. l am very great to be here with all of you. ladies and gentlemen, now I would like to talk about the students are used to working hard in academics. Before we start, l would like to ask you. Do students spend too many hours learning? Nowadays, most parents pay for extra classes for their children after school. May not be good for them, to spend time too many hours learning ?
The advantage of extra classes for students can help them to improve their skill and ability of studying. The students will have new friends and share ideas to each other, when they attend the extra classes. On the other hand, longer school days could result in attention to be down and make the extra class time ineffective. For example, when students are too tired ,the concentrate in the last hour of the day becomes useless. It also have another disadvantages. Children will feel tire and do not join in sport activities. To attend extra classes, children need to stay back after school. This is very tire for them because they can not go home early and sacrifice their rest time. Since they are tire, they are not mood and dynamic to join in sport activities. It maybe will affect the children's health.
Other than that, attend extra classes maybe will waste the time. Some children may not be serious at class and annoying others. It will embarrass or hinder teacher to teach. So, it will waste the time of children to stay back after school. Also, children are tire after school. So, they will be vacancy at extra classes and not pay full attention to the teacher. It also will waste the time.
In conclusion, attend extra classes is a good way to improve children's studies and save the money. Every parents are hope their children can be exceptional student. But , parents need to insight children's emotional and always encourage them to be more industrious to attend extra class . Parents should pay for everything that them like to learn because of I believe that if the children like to learn something that they love, it will help them to develop themselves to be better. I hope you will enjoy with my presentation. Thank you for your attention!