Failing anatomy by 2%..

I am 19 and in nursing school. I am currently in anatomy and physiology.

I am at a 76% and I need a 78% to pass.

The teacher is extremely hard and I am literally broken down crying right now.

I am doing a worksheet right now and am just crying. I have ways wanted to be an RN and even got accepted into the program after taking the entrance exam.

My depression was really bad at the beginning and it made my grades go down. I really need to pass and am struggling so much to a point where I am wondering if I should switch majors. I want to be in the medical field.

I am just so stressed. My closest friend is in the child care program and just doesn't understand.

Nursing is very difficult. I am doing this worksheet and every point counts at this point. I am in a pickle at this point. I got a 93% on the lab practical and can do the same for this next one, but I am just so stressed and confused.

This worksheet has a rule where we can not get help from any people. It is just on our own. My books and notes, and the answers aren't even in them. I have been working on it for 3.5 hours and have 1/3 of it left let that I do not know. I am really struggling.

Any advise...?