Well, at the 1200 level being able to spot tactics tends to be more important than doubled pawns and the like. Probably Reinfeld's "1001 winning sacrifices and combinations" is a good palce to begin. I personally don't own it. Instead I read Seirawan's Winning Chess Tactics and Heisman's Back to Basics: Tactics... same idea, more text.
Reinfeld's book is well-known and on Amazon you'll find reviews like:
"I don't know how good you'd have to be not to profit from them; but if you're between 1200-1500, Reinfeld's puzzle books are for you. In fact, I don't know of any better ones."
"without a doubt the greatest tactical teaching tools for anyone over 1200 strength(strong beginner)."
Hello. I am a 1200 USCF rated player (still somewhat of a beginner) and I have gotten books from an old bookstore containing books for 1$ and less. Here are the ones I have, and I don't know what I should study.
Judgment and Planning in Chess by Max Euwe
My System by Aron Nimzovich
The Game of Chess by Siegbert Tarrasch
The Art of Attack in Chess by Vukovic
The Russians Play Chess by Irving Chernev
Solitaire Chess by Horowitz
1001 winning sacrifices and combinations by Reinfeld
Improve your Endgame Play (and Opening one) by Flear and the other by Ward
Understanding Chess Move by Move - by John Nunn
Game of Chess by Golumbek
Chess Endings: Essential Knowledge by Averbakh
Combinations: Heart of Chess by Chernev
Also, I have previously read Logical Chess Move by Move (several years ago, as I have not played for several years now). I don't know which book(s) to use for slow study, as I would like to attend a few tournaments in March and May. By the way, I have usually been a defensive minded player, who makes solid moves, though I would like to be able to calculate combinations, etc. (tactics basically that aren't easy to see) and basically just improve. My main question is: where should I go from here (what should I read first)? Is My System suitable for my level, etc..