49 days left...

tomorrow i have general paper test,but i've over stressed until i don't even dare to study. i think the brainwave couldn't recover my thinking ability in time,what should i do? i can't generate ideas to write essay,i can't understand mathematical reasons,i can't learn physics' concepts. i am totally a mental retarded disable person. i have been training so hard in the 5.0 environment and every efforts just lose like that. i m not a above-average student anymore,i can't think critically.... why god punishes me at such disadvantageous time,why god takes away something that is really belonging to me?