LOL.. You made my day. I also face the same situation all the time..yes all the time. Nothing wrong with you..If you don't study you gone fail your exam.It is so simple...I didn't study and I failed too...

Now, addressing your problem, I faced the situation because my mind is thinking about something else. I was in stress and couldn't able to focus on my study at all.. If you have any problem you are going into right now, you have to forget it and just focus. 

Good Luck and go out from sajha until you finish your exam.

FOCUS FOCUS AND FOCUS.........ON YOUR BOOK..IF YOU DON'T STUDY YOU GONE FAIL AND I DON'T WANT YOU TO FAIL YOUR EXAM...SO BEST OPTION IS STUDY.....