necessary focus

I have a big exam tomorrow, please pray that the Lord bless this exam and give me the necessary focus to succseed.

Against distractions...it seems every time I try to give the nessasary focus on something, something "chimes in" to distract me, a beeping noise from the cellphone indicating a message,or the phone will ring, or some noise from somewhere distracts me. Before, while I was waiting for a customer...