what's wrong with me?!

I thank God that He opened the door for me to nursing school.. but.. i have no idea why im doing so horribly! I study. Go over the material with my classmates. Feel pretty confident when taking my tests and then BOOM-- get my grades back and I bombed it! I dont get it. What's wrong with me?! Why can't i just get the material?! What am i doing wrong?! I even went to tutorial.. saw a academic counselor.. n still... sigh.... Lord-- please help me.. I need a miracle! I know I cant do this on my own.. I need you to just... bless me with this incredible wisdom where I can fully understand the material and successfully graduate nursing school.