If you have 4years college then finish your bachelors! easiest way possible, get that degree!( plus you'll always have it to work in other areas as a college-graduate if you wish). Then do an accelerated program to get your BSN in two years thats what I did.

You mentioned neuroscience, that should mean you have a lot science? So a lot of your pre-reqs should be good. Your GPA needs to be at least 3.5 to have a shot at a program. It will be hard. When you are an RN it will be even harder.

With that said...seriously reevaluate your choices. Nursing is NOT what you think, the pay is lower that what you think, jobs are very hard to get, it is easy to get pigeon-holed in certain areas of healthcare, the stress is enormous, people/patients/families can be so nasty, more often than not, many, many cnas and other nurses are dumb, mean, and flat out rude, doctors dont respect you, you will get blamed for everything, nurses get fired for tiny things, on and on...

go for a pharmacy degree if you can handle the chemistry, big money, must less stressful and treated better.

honestly, I think Id be happier being an xray tech if I could go back...when will they invent that time machine?