Dear,

Many neuroscientists don’t know any calculus or physics! They tend to be the ones who come from psychology, medicine, biology, and biochemistry backgrounds. If you have the time and inclination, I’d recommend focusing on linear algebra, differential equations, statistics, and maybe basic electrodynamics and electronics. If you eventually become a neuroscience researcher you’ll have a better idea of what your lab expects of you. General-purpose preparation can only take you so far. Alternatively, identify the particular kinds of questions and techniques you are interested in, and then see what background knowledge is necessary. While many branches of neuroscience use a lot of math, most have significant areas which are decidedly non-mathematical. There is one exception: neuroengineering.

Hope this helps!