hopeful_app

Hi all, I'm a former biology major from a decent (US) public university who graduated within the past few years. During undergrad, I was heavily focused on medical research (3 publications in lesser-known journals) but unfortunately did not fully realize my interest in biostats until near graduation, when I took a course on probability and statistics in the context of phylogenetics. I did well and enjoyed the class immensely. Throughout undergrad, I did work with statistical software, learned some basic programming, and analyzed experimental data, but nothing too serious. Because of this, my academic math background is limited to 2 semesters of calculus taken at a community college and 3 semesters (including multivariate calc) taken at my university as a refresher. I received A's in the community college courses but to my dismay, barely scraped by at my university. I am certain I could have performed better, but there isn't much I can do now besides own up to my mistakes. I waived the university requirement for stats through a 5 in AP Stats in high school, a decision I am now regretting deeply as I have no letter grade for the subject on my transcript. I tried to redeem myself and studied 2 months for the GRE while working. Received a 169V/167Q/5.5W. I'm already mid-app for some MS Biostats programs now, but I'm realizing how bad my quantitative background must look to adcoms. Should I withdraw my applications, take some linear algebra/real analysis and come back next year? I had difficulty getting ahold of some of my professors and the thought of hassling them for recs again seems painful. (Is it possible to keep my letters on record?) Appreciate any insight!