students spend too many hours studying

Good afternoon, teacher 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
" students spend too many hours studying". Before we start, l would like to ask you. Do you think the students spend too many hours studying ? Nowadays, students are used to working hard in academics. Most parents pay for extra classes for their children after school. May not be good for them, to spend too many hours studying ?
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. The students will feel tire and can not join in activities. To attend extra classes, They 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 activities. It maybe will affect the student's health.
Other than that, attend extra classes maybe will waste the time. Some students may not be serious at class and annoying others. It will embarrass or hinder teacher to teach. So, it will waste the time of students to stay back after school. Also, students are tire after school, they will be vacancy at extra classes and not pay full attention to the teacher. It also will waste the time.
In conclusion, parents shouldn't give your children extra classes after school , but you should pay for everything that them like to learn because l believe that if the students like to learn something that they love, it will help them to develop themselves to be better. So, parents do not need to give their children extra classes and too many hours learning. Thank you very much.