Surely there's a study guide you could steal?
Gambit Book Collection. Which Should Read First
Possibly of interest:
A COMPLETE CHESS COURSE by Antonio Gude
http://www.gambitbooks.com/pdfs/A_Complete_Chess_Course.pdf
50 ESSENTIAL CHESS LESSONS by Steve Giddins
https://web.archive.org/web/20140708100833/http://www.chesscafe.com/text/review534.pdf
http://www.gambitbooks.com/pdfs/50_Essential_Chess_Lessons.pdf
LEARN CHESS TACTICS by John Nunn
https://web.archive.org/web/20140708233820/http://www.chesscafe.com/text/review422.pdf
http://www.gambitbooks.com/pdfs/Learn_Chess_Tactics.pdf
A COURSE IN CHESS TACTICS by Dejan Bojkov & Vladimir Georgiev
https://web.archive.org/web/20140708085211/http://www.chesscafe.com/text/review757.pdf
http://www.gambitbooks.com/pdfs/A_Course_in_Chess_Tactics.pdf
Chess Strategy for Kids by Thomas Engqvist
http://www.gambitbooks.com/pdfs/Chess_Strategy_for_Kids.pdf
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
Chess Tactics for Kids
https://web.archive.org/web/20140708233318/http://www.chesscafe.com/text/review394.pdf
http://www.gambitbooks.com/pdfs/Chess_Tactics_for_Kids.pdf
Chess Openings for Kids
https://web.archive.org/web/20140627040230/http://www.chesscafe.com/text/hansen146.pdf
http://www.gambitbooks.com/pdfs/Chess_Openings_for_Kids.pdf
Fundamental Chess Openings,
https://web.archive.org/web/20140626173432/http://www.chesscafe.com/text/hansen128.pdf
http://www.gambitbooks.com/pdfs/FCO_Fundamental_Chess_Openings.pdf
Understanding Chess Middlegames by GM John Nunn
https://web.archive.org/web/20140627012322/http://www.chesscafe.com/text/hansen154.pdf
http://www.gambitbooks.com/pdfs/Understanding_Chess_Middlegames.pdf
Understanding Chess Endgames by GM John Nunn
https://web.archive.org/web/20140708234309/http://www.chesscafe.com/text/review704.pdf
http://www.gambitbooks.com/pdfs/Understanding_Chess_Endgames.pdf
CHESS ENDINGS MADE SIMPLE by Ian Snape
https://web.archive.org/web/20140708103438/http://www.chesscafe.com/text/review430.pdf
http://www.gambitbooks.com/pdfs/Chess_Endings_Made_Simple.pdf
SECRETS OF PAWN ENDINGS by Karsten Müller & Frank Lamprecht
https://web.archive.org/web/20140708093728/http://www.chesscafe.com/text/secpawnendings.pdf
http://www.gambitbooks.com/pdfs/Secrets_of_Pawn_Endings.pdf
THE SURVIVAL GUIDE TO ROOK ENDINGS by John Emms
http://www.gambitbooks.com/pdfs/The_Survival_Guide_to_Rook_Endings.pdf
FUNDAMENTAL CHESS ENDINGS by Karsten Müller & Frank Lamprecht
http://www.gambitbooks.com/pdfs/Fundamental_Chess_Endings.pdf
Understanding the Chess Openings,
https://web.archive.org/web/20140627031504/http://www.chesscafe.com/text/hansen76.pdf
http://www.gambitbooks.com/pdfs/Understanding_the_Chess_Openings.pdf

Good Chess Books for Beginners and Beyond...
https://www.chess.com/blog/RussBell/good-chess-books-for-beginners-and-beyond
Dear All.
I have a plan to purchase hard book from Gambit Collection which really good for me.
Actually I have play chess in my age of 5-8 old, I already join chess club and beating adults chess player. But then I stop play until now, I already 23 years old and never play chess after 8 years old.
So now, I am turn back to a beginer level.
Please tell me, which Gambit's book should I purchace to learn to increase to chess level?