<p>you would want to make sure you’re doing biology in arts and sciences, for starters.</p>
<p>you have to take some courses before you can even apply for the math major, so you would want to take those early on if you’re serious about possibly making that a major. I’m getting that information from here: [Cornell</a> Math - The Undergraduate Major in Mathematics](<a href=“http://www.math.cornell.edu/Undergraduate/Major/major.html]Cornell”>http://www.math.cornell.edu/Undergraduate/Major/major.html)
I am not sure it would be a great idea to <em>plan</em> to go two whole years (four semesters!) before deciding whether you want to become a math major though.</p>
<p>I don’t know what kinds of jobs math majors get…I don’t know that anyone’s getting good jobs these days? it looks like there is a “concentration” thing you can do by combining the math major with something else, so you might consider one of those as a way to apply the math you learn.</p>
<p>as a bio major, I think you should also consider staying with biology. it’s a fully reasonable major just on its own. it’s not like it’s just another word for pre-med.</p>