I am unable to concentrate in Salaat.

Answer

Abstain from sin and futility, and increase Thikrullaah. Concentration in Salaat depends on one's life style. A person who for example indulges in haraam internet, facebook, etc. or consumes doubtful and haraam food, or oppresses others, or does not pay his creditors, etc., etc. should not expect the ability to concentrate. Also, how can a man concentrate in Salaat when his eyes and mind are soiled with looking at females or if he uses his tongue for nonsense and haraam? A man addicted to chat-groups should not expect concentration in Islam. There are many factors which contaminate the mind and ruin concentration.