Bio degree to BSN degree?

I am currently enrolled as a freshman in college with a biology major. I would like to become a RN but my grades this first semester weren't as good as I would like (B's and a C). Now that I have adjusted to college and brought my grades up from what they used to be (B's,C's, and a D), I want to know if I can get into a nursing school if the next 2 semesters have exceptional grades. Also would it be easier to get into nursing school if I graduated with my biology degree first? Thanks!