Read Books About The Different Areas In Chess (Opening,Middle Game, Endgame,Etc) Study Them Thoroughly And Review GM Games. Play Blindfold Chess Or Even Just in Your Head And Replay The Game From Memory OTB. Tactics On Chess Tempo help With Calculation do 100 a day correctly and You Should Start Improving.
Books I Recommend:
1.60 Most Memorable Games By Bobby Fischer
2.Think Like A Grand Master By Alexander Kotov
I have just joined this website for nearly a month but i want to improve more on my calculation n chess games.Just want to ask for opinion on how can i improve on my calculation on strategy,tactics ,endgame or opening?