I want a speech? I am acting as DEO of my school for self government day.. . I should give a speech for children about thei. Studies and other stuff... .

Such questions need to be attempted on your own to test your creative writing skills. However, these points might help you elaborate:
 
- on this day of 'self government', I want to reiterate the importance of self discipline
- if we follow and observe certain values, then life becomes orderly: theses are the values of sincerity, punctuality, diligence
- as students, it is our job to study well and learn as many things as possible in school
- do everything with dedication: study hard and also enjoy your play time
- pick up hobbies to learn new skills: play the guitar, go swimming, read, etc
- respect your elders and learn from their experience