I came across a hadith which says " That only thay part of your prayer in which you are fully conscious is accepted" I'm not able to fully concentrate in my prayes. I'm easily distracted with every noise and this is why I recite every prayer 2-3 times and still I have doubt weather they are accepted or not?
Please tell me what to do

Try to pray in quite areas, and strive your self to concentrate. However, lose of concentration does not make the prayer void, as long you know what you are doing. Hence , there is no need to repeat the prayers.