why my point of exam is severe ? because i didn't try in test ,i read book not enough, i didn't aim in class or i am silly it's very bad. i have unhappy and complaint in its. i udersirable this design. i'm so sad i demand to 4 in next exam 555 55 5 55 i will hope it's be too much for ,but i believe in next ,it will be better than today. i will be try again. i sure :)