Update: I wasted lots of time, and studied openings way too much. I improved a lot anyways. Robert_New_Alekhine was right. I should have been studying the endgame and classics; openings hardly matter in comparison, especially theory.
Chess Book Recomendations

I agree wholeheartedly with previous posts that recommend the Yusupov series. Follow his instructions to the letter and do the hard work that he expects and you will certainly improve.
Another source that I think is excellent is Igor Khmelnitsky's "Chess Exam". After working through 100 positions, you are rated on 12 aspects of chess play. This gives you a good idea of what areas you should focus on in your studies, thus directing your limited study time to where it is most needed. There are two added bonuses: you will learn a lot by carefully studying the solutions, and the questions about the positions address an area that is usually neglected in chess instructional material: evaluation of the position. This book is great for increasing your understanding of chess, as well as your own strengths and weaknesses.

Thanks for the tips. I know what I need to work on, my previous study seems almost aimless in comparison to now.

Update: I wasted lots of time, and studied openings way too much. I improved a lot anyways. Robert_New_Alekhine was right. I should have been studying the endgame and classics; openings hardly matter in comparison, especially theory.
How can it be a waste of time, though? I'm sure you got something out of it. I know, you could've done something that would've given faster improvement, but I assume at your level you already need to know some opening stuff too. So you'll save some time later, when you get back to openings. At least that's my logic on that. :-D

I am high class b in rating (1753 USCF) but I am estimated to be class a in strength.
I am looking for what would be the best books for me to improve, I am 14 (almost 15) and have study time and a lot during the summer.
I won't skim the books if they are good, but actually study them.
I already have:
My System
Chess Praxis
New York 1924
Dvoresky's endgame manual
Silmans endgame
Chess strategy for the tournament player
and plan to study those completely first, but what other books are worth buying and studying at my level?
Who are author's for #3 and #6?
Hola.
Soy un aficionado al ajedrez que ha escrito un cuento que, creo, os puede gustar.
Alberto, un amigo (él si que está viciado) me comentó que no existían muchos libros buenos de ajedrez para niños.
La obra debía ser mas ambiciosa, con este cuento, anécdotas de ajedrecistas famosos, etc... pero se quedó solo en el cuento.
Quiero creer que el cuento se desarrolla a dos niveles, para resultar ameno a padres y a niños.
Con la escusa del ajedrez aparecen temas como el feminismo, la fuerza de la inteligencia, el pacifismo,....
En la WEB de Amazon podéis leer el inicio:
https://www.amazon.es/El-ajedrez-%C2%A1qu%C3%A9-gran-invento-ebook/dp/B01HX5VE5O?ie=UTF8&ref_=cm_cr_arp_d_product_top
Espero que os guste.
Un saludo.