I think if you are dedicated to it and it is what you want to do, you will be successful. I would try the anatomy classes and microbiology classes and see how those go. I remember some of my classmates struggling with these and some of them were taking these classes for the 3rd time...but it just shows you their dedication and motivation to get into nursing school. I do not think the material itself in my nursing school classes was challenging, it was just a lot of information to cover in a 2 year period and did take many hours of studying, studying harder than you ever have in your life. My motivation for studying every little detail was so that when I go out there and I am taking care of real people, I know what I am doing and I will not hurt anyone. And it is very important to set aside the time to study well, your time with family and friends will have to be sacrificed and your house may not be as clean as you would like it, and you may not even have time to cook, go to the gym etc. I was a server for 5 years before nursing school and I think the time management, prioritization, and customer service skills you acquire through that have helped me tremendously as a new nurse. They say that the time management is the hardest part of being a new nurse because you need to practice it, but I think as a server you learn to deal with multiple people pulling you in 5 different directions all day long and you learn to handle it without looking frazzled. Just look at the pre-reqs as stepping stones to a bigger goal, they are not fun to do and they may seem hard and like they have nothing to do with nursing, but unfortunately that's what they make us do
If you absolutely need to have a steady income during nursing school and serving tables is not cutting it, I would say do the LPN route, but if you are getting by serving tables, I think you should just go for the RN. Serving jobs are much more flexible, there's usually lots of students working in restaurants so the managers are usually lenient about workers taking time off for exams,etc. you can pick your shifts,switch when you need to, and there's so much less responsibility than LPN/RN...sometimes I wish I was a server again so that I didn't have to deal with this much responsibility, so I would enjoy it while you can.