i need help in calculation mainly , i cant concentrate in the middlegame , and i blunder like instantly . that is a lesser problem for me . i cant really calculate deeply or calculate the right way . like cct method is become not so useful . so i am trying to find a better way or a book that helps in calculation . i dont need a really advanced book . just a book or a method or some tips on how i can think in a game . a book which helps in planning ,thinking would really help .
Step 1. Press 10+5 in main menu
"i need help in calculation"
* Stop playing bullet or blitz. Play 15+10 rapid instead and use all your time.
"i blunder like instantly"
* Blunder check before you move. A great help is to enable move confirmation in your profile.
"a book which helps in planning ,thinking"
* Think Like a Grandmaster - Kotov
"... For many people with little time for chess the default option is internet blitz, in which the players have five minutes or less for the entire game. I cannot warn too strongly against taking this route if you want to improve, the problem being that playing too many games at a fast time limit will corrupt the decision making process. Instead of playing good moves, a player honed on blitz will look for moves he can make quickly and perhaps bring himself closer to a win on time. ...
... you need to keep to time limits in which the chess position is more relevant than the thinking time, and, ideally, much more relevant. I actually believe that only Grandmasters (2500+) should play five minute blitz, ... 1500 players should have at least 25 minutes thinking time for a game -- or a rough equivalent if they are using an incremental time limits. ..." - GM Nigel Davies (2010)
Maybe, you can find something useful at https://lichess.org/forum/general-chess-discussion/what-books-to-read-for-improvement-rating-1400-1500-fide.
"... There are several problems which can arise as a result of Kotov's method. ..." - GM John Nunn (1998)