I want speech for being elected as topaz house captain

Such questions need to be attempted on your own to test your creative writing skills. However, these points might help you elaborate:
 
- introduce yourself
- speak of your academic and co-curricular achievements
- tell how you will do value addition to the system
- increased role of students in making school policies
- your emphasis on discipline to be maintained
- request for smart classrooms even for primary section, digital education to be integrated in the school curriculum
- more educational trips: to Science Museum, historical places of interest, Modern Art gallery, etc.
- involvement of students in community activities: cleanliness drive, 'Swacch Bharat Abhiyan', literacy campaign, use of paper bags
- the Topaz House is sure to shine and glitter brighter than any other gem if you give me the opportunity to be the House Captain
- convince students to vote for you: 'I win, you win!' 'Vote for positive change', etc