When you set up and orient the board make sure the sun is shining in his eyes.
How to improve my chess
Possibly helpful:
Simple Attacking Plans by Fred Wilson (2012)
https://web.archive.org/web/20140708090402/http://www.chesscafe.com/text/review874.pdf
https://www.newinchess.com/Shop/Images/Pdfs/7192.pdf
Logical Chess: Move by Move by Irving Chernev (1957)
https://web.archive.org/web/20140708104437/http://www.chesscafe.com/text/logichess.pdf
The Most Instructive Games of Chess Ever Played by Irving Chernev (1965)
https://chessbookreviews.wordpress.com/tag/most-instructive-games-of-chess-ever-played/
Winning Chess by Irving Chernev and Fred Reinfeld (1949)
https://web.archive.org/web/20140708093415/http://www.chesscafe.com/text/review919.pdf
Discovering Chess Openings by GM John Emms (2006)
https://web.archive.org/web/20140627114655/http://www.chesscafe.com/text/hansen91.pdf
Openings for Amateurs by Pete Tamburro (2014)
http://kenilworthian.blogspot.com/2014/05/review-of-pete-tamburros-openings-for.html
Chess Endgames for Kids by Karsten Müller (2015)
https://chessbookreviews.wordpress.com/tag/chess-endgames-for-kids/
http://www.gambitbooks.com/pdfs/Chess_Endgames_for_Kids.pdf
A Guide to Chess Improvement by Dan Heisman (2010)
https://web.archive.org/web/20140708105628/http://www.chesscafe.com/text/review781.pdf

Aside from learning basic tactics, learn about tempo, gaining tempo and make your opponent lose tempo. https://en.wikipedia.org/wiki/Tempo_(chess)

The forums isn't the best place for advice. You might get trolled, and others may not even know what they are talking about. My advice to you is to do your own homework. Just browse around on chess.com, lichess, youtube, google, Dan Heismans website, among many many other things. The information out there about chess is so massive that you cannot possibly know everything and also there may be more than one right answer to your question.
It's impossible to know what exactly you would need for you as a chess player because we do not know you. Your best bet is to go seek out local chess players in your area and ask someone much better than you to analyze your game and give you a few pointers, and also, perhaps if you can, hire a coach. There are some coaches on my friends list with varying prices. If you want free advice on how to improve then I am not the person to give it to you. Though I am not very high rated, I do know a lot of pointers that I learned from reading Dan Heismans book A guide to chess improvement. I have decided to stop posting stuff I learned from that book. Good luck on improving. It's nice to get better than your Rivals, however, if all you want to do is learn to become better than your friend, then perhaps you should rethink why you want to study chess, as true chess is an Art. It is not about learning how to beat joe smoe. It's about learning about yourself, and life. I hope this helps.
I am a 15 year old and I live in South Africa.Currently on holidays and have a lot of free time on my hands.I have about a month and a half before going back to school and was wondering in this time how could I seriously improve my chess.I have a rival who is slightly better than me and when the school opens I want to be able to beat him.