I've crammed quite a few times before tests/exams, and let me tell you, the results clearly reflect on my lack of effort.
Motivation is one thing which I heavily lack, as I just browse the internet all day doing barely anything, and when I do complete any assignments, they are half-assed...
Personally, I feel as though Neuroscience is a very interesting subject - one which certainly intrigues me. However, ultimately it is up to you to choose what is best for yourself.
Good luck with your studies.