struggling student

I am a medical student and am doing very poorly in my classes. I had failed a test previously and am going to take a test on Dec 19th. I need god's help to pass this test. I am desperately seeking for God's help and am studying to the best of my capabilities but I feel like my attempts are always falling short. I need God to help me and I feel like he probably doesn't answer my prayer because I did something wrong. I know I am not perfect and I asked God for forgiveness, but I really need him to help me. The last couple of years have been the hardest years for me and the only way I have been able to survive is through God's help but there is always unpredictability regarding my future. I need God to help me. I want him to forgive my sins and answer my prayer. I don't know who else to turn to except my Lord.